platform: msm8996: display: enable display support on msm8996 target

Add all display driver and backlight driver part of msm8996
build chain. This enables the splash screen for 8996 target.

Change-Id: I50f4359a997eb21062447f37b27a1332173f5738
diff --git a/project/msm8996.mk b/project/msm8996.mk
index 664c0ae..2a8ef25 100644
--- a/project/msm8996.mk
+++ b/project/msm8996.mk
@@ -21,6 +21,7 @@
 ENABLE_PARTIAL_GOODS_SUPPORT := 1
 ENABLE_RPMB_SUPPORT := 1
 ENABLE_GLINK_SUPPORT := 1
+ENABLE_PWM_SUPPORT := true
 
 DEFINES +=VIRTIO=1