[Feature][ZXW-130]merge P50U02 version

Only Configure: No
Affected branch: master
Affected module: unknow
Is it affected on both ZXIC and MTK: only ZXIC
Self-test: Yes
Doc Update: No

Change-Id: I4f29ec5bb7c59385f23738d2b7ca84e67c100f69
diff --git a/ap/build/common.mk b/ap/build/common.mk
index 3736593..b82065f 100755
--- a/ap/build/common.mk
+++ b/ap/build/common.mk
@@ -30,3 +30,8 @@
 ifeq ($(USE_FOTA_AB),yes)
 CFLAGS   += -DFOTA_AB
 endif
+
+ifeq ($(USE_NVRO_BACKUP),yes)
+CFLAGS   += -DUSE_NVRO_BACKUP
+endif
+