build fails with IA_IMAGING not found

Attempting to build on a Fedora36 system, and the initial cmake command fails:

```
$ make -DCMAKE_BUILD_TYPE=Release -DIPU_VER=${IPU6_VER} -DENABLE_VIRTUAL_IPU_PIPE=OFF -DUSE_PG_LITE_PIPE=ON -DUSE_STATIC_GRAPH=OFF -DCMAKE_INSTALL_PREFIX=/usr ..
CMake Deprecation Warning at CMakeLists.txt:17 (cmake_minimum_required):
Compatibility with CMake < 2.8.12 will be removed from a future version of
CMake.

Update the VERSION argument value or use a ... suffix to tell
CMake that the project does not need compatibility with older versions.

-- install prefix: /usr
INFOadd definition -DIPU_SYSVER_ipu6v5 for ipu6ep
-- Checking for module 'ia_imaging'
-- Package 'ia_imaging', required by 'virtual:world', not found
CMake Error at cmake/FindIA_IMAGING.cmake:28 (message):
IA_IMAGING not found
Call Stack (most recent call first):
CMakeLists.txt:269 (find_package)

-- Configuring incomplete, errors occurred!
```

I've definitely got the headers installed from ipu6-camera-bins, so I'm not clear why they're not being found:
```
'ipu6ep/include/ia_imaging/ia_types.h' -> '/usr/include/ia_imaging/ia_types.h'
'ipu6ep/include/ia_imaging/ia_view.h' -> '/usr/include/ia_imaging/ia_view.h'
'ipu6ep/include/ia_imaging/ia_view_types.h' -> '/usr/include/ia_imaging/ia_view_types.h'
```