tests/kms_pipe_color: Only test existing properties

Some platforms might not have degamma or ctm support.
We can only verify whether those properties behave properly
if they're available.

v2: reformat title (Arek)

Fixes: aa55641d4 ("tests/kms_color: New test for pipe level color management")
Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Arkadiusz Hiler <arkadiusz.hiler@intel.com>
1 file changed