Update Coral SVN to 28

Bug: 163542576
Change-Id: I242840f92b6c0c0ae78a4e6af5d7e4c5febc9927
(cherry picked from commit d2b9321a9d6cd0b0fc6edc862f31ab7621eaf21c)
diff --git a/device.mk b/device.mk
index 3b11cbc..54f82fd 100644
--- a/device.mk
+++ b/device.mk
@@ -966,7 +966,7 @@
 
 # Increment the SVN for any official public releases
 PRODUCT_PROPERTY_OVERRIDES += \
-	ro.vendor.build.svn=27
+	ro.vendor.build.svn=28
 
 PRODUCT_COPY_FILES += \
     $(LOCAL_PATH)/powerhint.json:$(TARGET_COPY_OUT_VENDOR)/etc/powerhint.json