[S5] Update SVN to 4 for SMR

Bug: 157106736
Change-Id: I120bd7e0aa85400b91ed46879ad48c67fa7a3c90
(cherry picked from commit 766ae7ab2d074ebcc1cb47df0a82af801c7d0eac)
diff --git a/device.mk b/device.mk
index 803c568..9b6c8f1 100644
--- a/device.mk
+++ b/device.mk
@@ -851,7 +851,7 @@
 
 # Increment the SVN for any official public releases
 PRODUCT_PROPERTY_OVERRIDES += \
-	ro.vendor.build.svn=3
+	ro.vendor.build.svn=4
 
 # ZRAM writeback
 PRODUCT_PROPERTY_OVERRIDES += \