disp: msm: drmP.h removed, add new headers

Commit ("drm: delete drmP.h + drm_os_linux.h") removes the
drmP header file. This changes updates the msm driver
by adding the individually required header files.

Change-Id: I360aa028c2ce75317d33da988b36164041177014
Signed-off-by: Samantha Tran <samtran@codeaurora.org>
Signed-off-by: Nilaan Gunabalachandran <ngunabal@codeaurora.org>

msm/dp/dp_display.c

@@ -9,6 +9,7 @@
 #include <linux/debugfs.h>
 #include <linux/component.h>
 #include <linux/of_irq.h>
+#include <linux/delay.h>
 #include <linux/soc/qcom/fsa4480-i2c.h>
 #include <linux/usb/phy.h>
 #include <linux/jiffies.h>