gralloc: Fix a HAL_PIXEL_FORMAT to DRM_FORMAT mapping

DRM and pixel formats have the order flipped.

HAL_PIXEL_FORMAT_RGB_888 -> DRM_FORMAT_BGR888

BUG=b:191096118
TEST=CtsNativeHardwareTestCases on Cuttlefish

Change-Id: I88315730075b6289463963a9c9071bd4f089447e
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/minigbm/+/3291554
Reviewed-by: Yiwei Zhang <zzyiwei@chromium.org>
Tested-by: Jason Macnak <natsu@google.com>
Commit-Queue: Jason Macnak <natsu@google.com>
1 file changed