CtsNativeHardwareTestCases: fix RGB565 formats.

The precision of RGB565 requires extending the accepted range of values
from [127, 128] to [123, 132].

floor(15./31.*255.) = 123 and ceil(16./31.*255.) = 132

Bug: 66900669
Bug: 74131503
Test: Passes on Pixel 2.
Change-Id: Ib22f3742aeb4c68e80be0895090a246c5c0321a5
1 file changed