disp: enable display driver code compilation

This change enables display driver compilation from
techpack path and removes stub file from display project.

Change-Id: I766a34d054e09466fddae379813568435327bef6
Signed-off-by: Narendra Muppalla <NarendraM@codeaurora.org>

Makefile

@@ -1,3 +1,15 @@
 # SPDX-License-Identifier: GPL-2.0-only
-ccflags-y := -Wno-unused-function
-obj-y := disp.o
+
+# auto-detect subdirs
+ifeq ($(CONFIG_ARCH_KONA), y)
+include $(srctree)/techpack/display/config/konadisp.conf
+export
+endif
+
+ifeq ($(CONFIG_ARCH_KONA), y)
+LINUXINCLUDE    += -include $(srctree)/techpack/display/config/konadispconf.h
+endif
+
+obj-y += msm/
+obj-y += rotator/
+obj-y += pll/

disp.c

@@ -1,5 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-
-static void _disp_techpack_stub(void)
-{
-}