Fix unused function input parameter compile warning

If the function input parameter is not used, the compile warning
will be generated. Use __attribute__((unused)) to eliminate
compile warning.

Test: mmm device/generic/goldfish-opengl, presubmit check.

Change-Id: Ia857b4d2d687a0c94b17d499f205302c98083772
Signed-off-by: Li Huihui <lihuihui@eswincomputing.com>
1 file changed