drm/msm: add HDR EOTF values

Define HDR (High Dynamic Range) EOTF (Electro-Optical Transfer Function)
standard values that can be used by user modules.

Change-Id: I34b75630df8c668e37bdf3e23fa78b35f1d18560
Signed-off-by: Ajay Singh Parmar <aparmar@codeaurora.org>