disp: msm: add support to request mdp core clk through mmrm

For Waipio onwards, mdp core clock rate needs to be requested
through the mmrm driver, which will make sure the requested
rate can be sustained by the its power rail, which is shared
by multiple clients.
Current change adds the support to request the mdp core clk rate
through mmrm driver as well as returns the corresponding failures
to user space during when a rate cannot be supported by the
system.

Change-Id: Icc0e8ab5b71e8c99baf7913bdbd96d9504cc11ae
Signed-off-by: Ingrid Gallardo <ingridg@codeaurora.org>

include/uapi/display/drm/sde_drm.h

@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0-only WITH Linux-syscall-note */
 /*
- * Copyright (c) 2017-2020, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2017-2021, The Linux Foundation. All rights reserved.
  */
 
 #ifndef _SDE_DRM_H_
@@ -691,6 +691,7 @@ struct drm_msm_display_hint {
 #define DRM_EVENT_LTM_HIST 0X80000008
 #define DRM_EVENT_LTM_WB_PB 0X80000009
 #define DRM_EVENT_LTM_OFF 0X8000000A
+#define DRM_EVENT_MMRM_CB 0X8000000B
 
 /* display hint flags*/
 #define DRM_MSM_DISPLAY_EARLY_WAKEUP_HINT         0x01