Set coral SVN to 15 for QQ1D builds
bug:146378789
(cherry picked from commit 306df25f40d9ab667737dccb6dd624be0e5592d6)

Change-Id: I1cbf4e1aecc26af6b71906ea9ea79e9360b523d9
diff --git a/device.mk b/device.mk
index d61f23d..5041d58 100644
--- a/device.mk
+++ b/device.mk
@@ -939,7 +939,7 @@
 
 # Increment the SVN for any official public releases
 PRODUCT_PROPERTY_OVERRIDES += \
-	ro.vendor.build.svn=14
+	ro.vendor.build.svn=15
 
 PRODUCT_COPY_FILES += \
     $(LOCAL_PATH)/powerhint.json:$(TARGET_COPY_OUT_VENDOR)/etc/powerhint.json