Merge the SuperUser feature branch into int/n/fp2

* origin/dev/n/FP2N-175:
  su: Introduce conditional for building

Issue: FP2N-175
Change-Id: I8481c443ad959abedcd16863764c85e1917d3f10
diff --git a/su/Android.mk b/su/Android.mk
index 297e0a3..4130310 100644
--- a/su/Android.mk
+++ b/su/Android.mk
@@ -1,3 +1,4 @@
+ifneq ($(FP2_USE_APPOPS_SU),true)
 LOCAL_PATH:= $(call my-dir)
 include $(CLEAR_VARS)
 
@@ -11,3 +12,4 @@
 LOCAL_MODULE_TAGS := debug
 
 include $(BUILD_EXECUTABLE)
+endif