Increase image diff value for low end devices

OEM are reporting that the diff value for the image comparison is to low
for images generated on a low end GPU

Test: virtualCamera_renderFromMediaCodec_golden_from_pixel
Test: virtualCamera_renderFromMediaCodec
Flag: TEST_ONLY
Bug: 350887625
Change-Id: I940783d5b714944bde61bc57b8e4df8a28721c54