platform: msm_shared: enable ubifs file system compilation

fermium system partition is based on UBI fs, hence adding the
support for ubifs compilation

Change-Id: I1117163a8d80d1dfc5676f060d1913344afbcbc6
diff --git a/platform/msm_shared/rules.mk b/platform/msm_shared/rules.mk
index d1ebd05..2b69f92 100644
--- a/platform/msm_shared/rules.mk
+++ b/platform/msm_shared/rules.mk
@@ -521,6 +521,7 @@
 			$(LOCAL_DIR)/spmi.o \
 			$(LOCAL_DIR)/bam.o \
 			$(LOCAL_DIR)/qpic_nand.o \
+			$(LOCAL_DIR)/flash-ubi.o \
 			$(LOCAL_DIR)/scm.o \
 			$(LOCAL_DIR)/dev_tree.o
 endif