system/core: Add command NATIVE_WINDOW_SET_BUFFERS_SIZE

Add native window command to set user defined buffer size.

Change-Id: Ib500e65283706d860d62cb487720008d7331ce2d
system/core: Add command NATIVE_WINDOW_UPDATE_BUFFERS_GEOMETRY

Add native window command to update buffer buffer width, height
and format before queuing the buffer.

Change-Id: Ic133f89afb762cfce5084af820af5f9bad2a4a0b