disp: msm: add runtime_pm ops support in drm driver

Add runtime_pm ops support in drm driver instead
of direct sde_power_resource_enable/disable call.
It allows drm driver to use runtime pm refcount logic
to track the resources instead of custom implementation.
The change also removes the NRT_CLIENT support from
sde_power_handle code to simplify it further.

Change-Id: Ib14692dca5876703d0a230da2512d731b69b8ebb
Signed-off-by: Dhaval Patel <pdhaval@codeaurora.org>

msm/dsi/dsi_display.h

@@ -239,9 +239,6 @@ struct dsi_display {
 	struct dsi_bridge    *bridge;
 	u32 cmd_engine_refcount;
 
-	struct sde_power_handle *phandle;
-	struct sde_power_client *cont_splash_client;
-
 	void *clk_mngr;
 	void *dsi_clk_handle;
 	void *mdp_clk_handle;