drm/amd: drop use of drmp.h in os_types.h

Drop use of the deprecated drmP.h from display/dc/os_types.h

Fix all fallout after this change.
Most of the fixes was adding a missing include of vmalloc.h.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: "David (ChunMing) Zhou" <David1.Zhou@amd.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20190609220757.10862-4-sam@ravnborg.org

drivers/gpu/drm/amd/display/modules/color/color_gamma.c

@@ -23,6 +23,9 @@
  *
  */
 
+#include <linux/mm.h>
+#include <linux/slab.h>
+
 #include "dc.h"
 #include "opp.h"
 #include "color_gamma.h"

drivers/gpu/drm/amd/display/modules/freesync/freesync.c

@@ -23,6 +23,8 @@
  *
  */
 
+#include <linux/slab.h>
+
 #include "dm_services.h"
 #include "dc.h"
 #include "mod_freesync.h"