Samsung Galaxy Book6 Ultra (Panther Lake): SSLC2000 sensor not supported

## Device info
- Laptop: Samsung Galaxy Book6 Ultra (PAMC)
- OS: Ubuntu 26.04 (Resolute Raccoon)
- Kernel: 7.0.0-15-generic

## Hardware
- IPU: Intel Panther Lake IPU (PCI 00:05.0, rev 0f)
- Camera sensor: SSLC2000:00 (Samsung)
- IVSC: ivsc_csi / ivsc_ace loaded

## Current status
IPU7 modules load successfully:
- intel_ipu7, intel_ipu7_isys, intel_ipu7_psys — loaded
- ipu7-drivers/0~git202602091007 via DKMS — installed
- Firmware ipu7ptl_fw.bin.zst — present

ACPI detects the sensor:
int3472-discrete INT3472:00: Found sensor SSLC2000:00 via SSDB controllogicid=0 fallback

But no kernel driver exists for SSLC2000. /dev/video0-31 are created
but streaming fails with "Link has been severed".

## What's missing
A v4l2-subdev driver for the Samsung SSLC2000 camera sensor.

## lspci
00:05.0 Multimedia controller: Intel Corporation Panther Lake IPU (rev 0f)