Update SVN to 7 for March 2018 Monthly Update
Bug:71860241
(cherry picked from commit da9a297f5073dba61a12498e84e8361b14e12292)

Change-Id: Ic304a64487f7ca2b49697bfd81e939857869cde9
diff --git a/device.mk b/device.mk
index 61eb971..9b93bd6 100755
--- a/device.mk
+++ b/device.mk
@@ -23,7 +23,7 @@
 
 # Set the SVN for the targeted MR release
 PRODUCT_PROPERTY_OVERRIDES += \
-    ro.vendor.build.svn=6
+    ro.vendor.build.svn=7
 
 # Enforce privapp-permissions whitelist
 PRODUCT_PROPERTY_OVERRIDES += \