drm/msm/sde: avoid invalid fb validation in plane rot check

Inline rotation validates the supported formats by
checking it against the format specified in the plane
framebuffer. Avoid validating the parameters in the
framebuffer during atomic-check cycle as the fb is
populated only during the commit cycle.

Change-Id: I98b59226916ab03af67c3e5c51d7316f8b59207b
Signed-off-by: Veera Sundaram Sankaran <veeras@codeaurora.org>