r600/crocus: Libva 2.14.0 problems with r600 and crocus based hybrid systems

Hi all

It looks that there exist some problems with Libva at multi GPU systems. Currently I have Mesa 22.2.0-devel (git-3dae544 2022-04-18 focal-oibaf-ppa) installed. The involved GPU drivers are **r600** and **crocus**. The Intel iGPU is a **Gen6** "Sandy Bridge" **Intel HD 2000** while the dGPU is a **Radeon HD 6770M** one.

In my case I get at the Intel iGPU:
```
test@test-iMac:~$ LIBVA_DRIVER_NAME=i965 DRI_PRIME=1 vainfo
libva info: VA-API version 1.14.0
libva info: User environment variable requested driver 'i965'
libva info: Trying to open /usr/lib/x86_64-linux-gnu/dri/i965_drv_video.so
libva info: Found init function __vaDriverInit_1_6
DRM_IOCTL_I915_GEM_APERTURE failed: No such file or directory
Assuming 131072kB available aperture size.
May lead to reduced performance or incorrect rendering.
get chip id failed: -1 [22]
param: 4, val: 0
libva error: /usr/lib/x86_64-linux-gnu/dri/i965_drv_video.so init failed
libva info: va_openDriver() returns -1
vaInitialize failed with error code -1 (unknown libva error),exit
```

While the Radeon dGPU works fine:
```
test@test-iMac:~$ LIBVA_DRIVER_NAME=r600 DRI_PRIME=0 vainfo
libva info: VA-API version 1.14.0
libva info: User environment variable requested driver 'r600'
libva info: Trying to open /usr/lib/x86_64-linux-gnu/dri/r600_drv_video.so
libva info: Found init function __vaDriverInit_1_14
libva info: va_openDriver() returns 0
vainfo: VA-API version: 1.14 (libva 2.6.0)
vainfo: Driver version: Mesa Gallium driver 22.2.0-devel for AMD TURKS (DRM 2.50.0 / 5.13.0-39-generic, LLVM 14.0.0)
vainfo: Supported profile and entrypoints
VAProfileMPEG2Simple : VAEntrypointVLD
VAProfileMPEG2Main : VAEntrypointVLD
VAProfileVC1Simple : VAEntrypointVLD
VAProfileVC1Main : VAEntrypointVLD
VAProfileVC1Advanced : VAEntrypointVLD
VAProfileH264ConstrainedBaseline: VAEntrypointVLD
VAProfileH264Main : VAEntrypointVLD
VAProfileH264High : VAEntrypointVLD
VAProfileNone : VAEntrypointVideoProc
```

System information:
```
test@test-iMac:~$ inxi -b
System: Host: test-iMac Kernel: 5.13.0-39-generic x86_64 bits: 64 Desktop: KDE Plasma 5.18.8
Distro: Ubuntu 20.04.4 LTS (Focal Fossa)
Machine: Type: Desktop System: Apple product: iMac12,2 v: 1.0 serial:
Mobo: Apple model: Mac-942B59F58194171B v: iMac12,2 serial: UEFI: Apple
v: IM121.88Z.0047.B1F.1201241648 date: 01/24/12
CPU: Quad Core: Intel Core i5-2500S type: MCP speed: 1596 MHz min/max: 1600/3700 MHz
Graphics: Device-1: Intel 2nd Generation Core Processor Family Integrated Graphics driver: i915 v: kernel
Device-2: Advanced Micro Devices [AMD/ATI] Whistler [Radeon HD 6730M/6770M/7690M XT] driver: radeon v: kernel
Display: x11 server: X.Org 1.20.13 driver: modesetting,radeon FAILED: ati unloaded: fbdev,vesa
resolution: 2560x1440~60Hz
OpenGL: renderer: AMD TURKS (DRM 2.50.0 / 5.13.0-39-generic LLVM 14.0.0)
v: 3.3 Mesa 22.2.0-devel (git-3dae544 2022-04-18 focal-oibaf-ppa)
Network: Device-1: Broadcom and subsidiaries NetXtreme BCM57765 Gigabit Ethernet PCIe driver: tg3
Device-2: Qualcomm Atheros AR93xx Wireless Network Adapter driver: ath9k
Drives: Local Storage: total: 931.51 GiB used: 117.06 GiB (12.6%)
Info: Processes: 211 Uptime: 5d 15h 35m Memory: 7.74 GiB used: 2.75 GiB (35.5%) Shell: bash inxi: 3.0.38
```

Note there exist a bug report at Mesa, see [#6326](https://gitlab.freedesktop.org/mesa/mesa/-/issues/6326) which shows also Libva problems in conjunction with an Intel **Gen5** iGPU and a **Radeon HD 6470M**. That report may be related to my problems described here. :wink: