hwc: Enable PP flag for metadata support

Enable POST_PROC flag to update PP features (HSIC/IGC/QSEED2)
info from metadata. Dynamically link ABL library.

Change-Id: Id5d8cf17eccb3ad8f1a671d0f3b5a96a7dbf7c00
diff --git a/common.mk b/common.mk
index a2283c4..cdac0fa 100644
--- a/common.mk
+++ b/common.mk
@@ -7,11 +7,6 @@
 common_includes += $(LOCAL_PATH)/../libhdmi
 common_includes += $(LOCAL_PATH)/../libqservice
 
-ifeq ($(TARGET_USES_POST_PROCESSING),true)
-    common_flags     += -DUSES_POST_PROCESSING
-    common_includes  += $(TARGET_OUT_HEADERS)/pp/inc
-endif
-
 common_header_export_path := qcom/display
 
 #Common libraries external to display HAL
@@ -21,6 +16,11 @@
 common_flags := -DDEBUG_CALC_FPS -Wno-missing-field-initializers
 common_flags += -Wconversion -Wall -Werror
 
+ifeq ($(TARGET_USES_POST_PROCESSING),true)
+    common_flags     += -DUSES_POST_PROCESSING
+    common_includes  += $(TARGET_OUT_HEADERS)/pp/inc
+endif
+
 ifeq ($(ARCH_ARM_HAVE_NEON),true)
     common_flags += -D__ARM_HAVE_NEON
 endif