disp: msm: dsi: add stub function parse power_cfg in trusted-vm

In trusted-vm, there are no power cfg entries in device-tree as
there is no support. Add stub function to avoid parsing errors
related to power cfg in trusted-vm.

Change-Id: Id28ad9a4d5608d561e22b318a08c6bc1ccc5f2ee
Signed-off-by: Veera Sundaram Sankaran <veeras@codeaurora.org>

msm/dsi/dsi_panel.c

@@ -3436,6 +3436,7 @@ static void dsi_panel_setup_vm_ops(struct dsi_panel *panel, bool trusted_vm_env)
 		panel->panel_ops.bl_register = dsi_panel_vm_stub;
 		panel->panel_ops.bl_unregister = dsi_panel_vm_stub;
 		panel->panel_ops.parse_gpios = dsi_panel_vm_stub;
+		panel->panel_ops.parse_power_cfg = dsi_panel_vm_stub;
 	} else {
 		panel->panel_ops.pinctrl_init = dsi_panel_pinctrl_init;
 		panel->panel_ops.gpio_request = dsi_panel_gpio_request;
@@ -3444,6 +3445,7 @@ static void dsi_panel_setup_vm_ops(struct dsi_panel *panel, bool trusted_vm_env)
 		panel->panel_ops.bl_register = dsi_panel_bl_register;
 		panel->panel_ops.bl_unregister = dsi_panel_bl_unregister;
 		panel->panel_ops.parse_gpios = dsi_panel_parse_gpios;
+		panel->panel_ops.parse_power_cfg = dsi_panel_parse_power_cfg;
 	}
 }
 
@@ -3530,7 +3532,7 @@ struct dsi_panel *dsi_panel_get(struct device *parent,
 		goto error;
 	}
 
-	rc = dsi_panel_parse_power_cfg(panel);
+	rc = panel->panel_ops.parse_power_cfg(panel);
 	if (rc)
 		DSI_ERR("failed to parse power config, rc=%d\n", rc);