drm/msm/dpu: enable DPU_MDP_AUDIO_SELECT for sc8180x

According to the discussion ([1]) on the mailing list, platforms before
sm8250 (and derivatives) should program HDMI_DP_CORE_SELECT register to
route audio to the DP ports. Enable DPU_MDP_AUDIO_SELECT on sc8180x to
program correponding register.

[1] https://lore.kernel.org/all/f86504ba-835a-6e30-6c30-8bb89b1359c4@quicinc.com/Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/518461/
Link: https://lore.kernel.org/r/20230115140022.489881-1-dmitry.baryshkov@linaro.orgSigned-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

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

@@ -553,7 +553,7 @@ static const struct dpu_mdp_cfg sc8180x_mdp[] = {
 	{
 	.name = "top_0", .id = MDP_TOP,
 	.base = 0x0, .len = 0x45C,
-	.features = 0,
+	.features = BIT(DPU_MDP_AUDIO_SELECT),
 	.highest_bank_bit = 0x3,
 	.clk_ctrls[DPU_CLK_CTRL_VIG0] = {
 			.reg_off = 0x2AC, .bit_off = 0},