drm/msm/dpu: add missing flush and fetch bits for DMA4/DMA5 planes

Note that with this, DMA4/DMA5 are still non-functional, but at least
display *something* in modetest instead of nothing or underflow.

Fixes: efcd010 ("drm/msm/dpu: add support for SM8550")
Signed-off-by: Jonathan Marek <jonathan@marek.ca>
Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Tested-by: Neil Armstrong <neil.armstrong@linaro.org> # on SM8550-QRD
Patchwork: https://patchwork.freedesktop.org/patch/545548/
Link: https://lore.kernel.org/r/20230704160106.26055-1-jonathan@marek.ca
Signed-off-by: Abhinav Kumar <quic_abhinavk@quicinc.com>

Author: flto

drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c

@@ -51,7 +51,7 @@
 
 static const u32 fetch_tbl[SSPP_MAX] = {CTL_INVALID_BIT, 16, 17, 18, 19,
 	CTL_INVALID_BIT, CTL_INVALID_BIT, CTL_INVALID_BIT, CTL_INVALID_BIT, 0,
-	1, 2, 3, CTL_INVALID_BIT, CTL_INVALID_BIT};
+	1, 2, 3, 4, 5};
 
 static int _mixer_stages(const struct dpu_lm_cfg *mixer, int count,
 		enum dpu_lm lm)
@@ -198,6 +198,12 @@ static void dpu_hw_ctl_update_pending_flush_sspp(struct dpu_hw_ctl *ctx,
 	case SSPP_DMA3:
 		ctx->pending_flush_mask |= BIT(25);
 		break;
+	case SSPP_DMA4:
+		ctx->pending_flush_mask |= BIT(13);
+		break;
+	case SSPP_DMA5:
+		ctx->pending_flush_mask |= BIT(14);
+		break;
 	case SSPP_CURSOR0:
 		ctx->pending_flush_mask |= BIT(22);
 		break;