max9x: use stream-aware active formats

[Angusche]

Summary

• use V4L2 subdev state format lookup for MAX9x active formats
• keep active format state stream-aware for deserializer source pads carrying multiple VC streams

Validation

• rebuilt and installed the DKMS module from patched source
• confirmed max9x loads from the DKMS updates path
• validated mixed multi-process streaming together with the HAL active-path setup change

[khaiwenng]

what issue is this PR trying to fix?

[Angusche]

what issue is this PR trying to fix?
We need 1 hal patch and 1 kernel patch to fix mix-resolution scenario.
max9x active format lookup was changed to use v4l2_subdev_state_get_format(v4l2_state, fmt->pad, fmt->stream) for active formats. This is required because the deserializer source pad carries multiple VC streams, so active format state must be per pad+stream rather than per pad only.