MA-10617 [#imx-836] Fix CtsMediaTestCases module test uncompleted issue

MA-10617 [#imx-836] Fix CtsMediaTestCases module test uncompleted issue

CtsMediaTestCases module CTS test can't uncompleted due to native crash,
the crash is due to memory leak in drm gralloc, when total leak reach to
4GB it will report mmap fail and cause CTS thread crash.

Crash log:
12-02 08:14:51.982 1156 25401 E gralloc-viv: gralloc_vivante_lock#573: failed to mmap
12-02 08:14:51.982 1156 25401 E gralloc-viv: gralloc_lock#136: err=-25
12-02 08:14:51.982 1156 25401 E gralloc : gralloc_lock lock memory failed
12-02 08:14:51.982 1156 25401 W GraphicBufferMapper: lock(0xed4c2740, ...) failed: 5
12-02 08:14:51.982 1156 25401 F SoftwareRenderer: frameworks/av/media/libstagefright/
colorconversion/SoftwareRenderer.cpp:230 CHECK_EQ( 0,mapper.lock( buf->handle,
GRALLOC_USAGE_SW_WRITE_OFTEN, bounds, &dst)) failed: 0 vs. 5

Dec. 20, 2017
Signed-off-by: Richard Liu <xuegang.liu@nxp.com>