Update Redbull SVN to 15

Bug: 173545603
Change-Id: I108b0412641fe526caaf8ba5f8878f076b864d4f
diff --git a/device-common.mk b/device-common.mk
index ecc67d7..b905055 100644
--- a/device-common.mk
+++ b/device-common.mk
@@ -838,7 +838,7 @@
 
 # Increment the SVN for any official public releases
 PRODUCT_PROPERTY_OVERRIDES += \
-	ro.vendor.build.svn=12
+	ro.vendor.build.svn=15
 
 # Enable iwlan service logging for debug
 ifneq (,$(filter userdebug eng, $(TARGET_BUILD_VARIANT)))