mm-video: vdec: update buffer size to avoid memory leaks

in use_output_buffer, the mapped buffer size need to match passed
buffer size for the native buffer in order for the munmap to cleanup
the ion buffer and avoid memory leaks. Without this change,
memory leaks were observed.

Change-Id: I53350ff70d528f955190ce1ebf94d1a2dd3f9b99
1 file changed