Add support for SIZE_HINTS Cursor Plane Property

• This is a draft Merge request to support the idea of SIZE_HINTS "https://patchwork.freedesktop.org/patch/526563/?series=113758&rev=3"
• This is intended to the optimal power usage by allocating optimal cursor size
• The draft MR has been programmed to perform the following

1. Reads exposed size hints for the given cursor plane.
2. Chooses nearestminimum cursor size out of the hints with respect to the user chosen cursor size from the UI.
3. Allocates optimized Hardware cursor size,hence drm buffer