Make libmix_imageencoder_tester use uncached source image buffer.

BZ: 175701

Issue: When SLC was enabled on MOFD, uncached
source buffer needed to be used or any data
in cached source buffer should be guaranteed
to be up-to-date.

Solution: On Camera capturing cases up-to-date
was natually guaranteed and this patch made
file2file test cases use uncached source buffer.

Change-Id: I4c7aa9b717faaefbc35e707bc8c1fd1c9d08f2d1
Signed-off-by: Jing SUN <jing.a.sun@intel.com>
1 file changed