gralloc: Add offset and size for plane layout components

The standard metadata type PLANE_LAYOUTS requires sizeInBits and
offsetInBits are set for the plane components. This change also
sets the default value for these fields to -1 to indicate that
they are unknown, unless explictly set.

CRs-Fixed: 2659196
Change-Id: If00c02939089c489ae7f72d916a010dd1f0734e3
1 file changed