drm/msm: add input validation before setting HDR infoframe

Move the input validation for the connector's HDR support
before calling the API to set the infoframe rather than within
the API itself.

This helps to avoid redundant checks and logging.

Change-Id: If21562920edb1613a73b5e18ab258a57e46c1d7b
Signed-off-by: Abhinav Kumar <abhinavk@codeaurora.org>