drm/msm/adreno: write reserved UBWC-related bits

On the latest A8xx Adreno chips several of the bits in the UBWC-related
registers are now hardwired to 1. Currently the driver doesn't write
them because there is no side-effect. In the preparation for the
refactoring in the next patch, write '1' to those bits anyway.

Reviewed-by: Akhil P Oommen <akhilpo@oss.qualcomm.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Patchwork: https://patchwork.freedesktop.org/patch/726504/
Link: https://lore.kernel.org/r/20260520-ubwc-rework-v5-15-72f2749bc807@oss.qualcomm.com

drivers/gpu/drm/msm/adreno/a8xx_gpu.c

@@ -288,6 +288,8 @@ static void a8xx_set_ubwc_config(struct msm_gpu *gpu)
 	switch (ubwc_version) {
 	case UBWC_6_0:
 		yuvnotcomptofc = true;
+		amsbc = true;
+		rgb565_predicator = true;
 		break;
 	case UBWC_5_0:
 		amsbc = true;