gralloc: Add support for "RAW" and "BLOB" formats

The allocation is done as specified in system/graphics.h
Raw formats are 16 bit and aligned to 32 bytes, blob formats have
a height of 1 and the size of the buffer is equal to the width.

Change-Id: If762a34dde3b78f138689ced1077c9529020ebf0
1 file changed