disp: msm: dsi: add support for phy/pll bypass

This change adds support for bypassing hw access in DSI PHY/PLL
drivers which enables the DSI driver to run on emulation
platforms that might be missing those modules.

Change-Id: I3e83155a79d60f2357606746214d776cefabd651
Signed-off-by: Rajkumar Subbiah <quic_rsubbia@quicinc.com>
Signed-off-by: Shamika Joshi <quic_shamjosh@quicinc.com>
Signed-off-by: Alex Danila <quic_eadanila@quicinc.com>

msm/sde/sde_kms.c

@@ -4720,6 +4720,9 @@ static int _sde_kms_get_splash_data(struct sde_splash_data *data)
 	int num_displays, num_regions;
 	struct sde_splash_display *splash_display;
 
+	if (of_find_node_with_property(NULL, "qcom,sde-emulated-env"))
+		return 0;
+
 	if (!data)
 		return -EINVAL;