Update Redbull SVN to 20

Bug: 175313938
Change-Id: I897bc9261ef8fe8cc9312890d174b0ffe3183a7a
(cherry picked from commit c176d2378c2a86ea1b8aedf88158dd78da4860f6)
diff --git a/device-common.mk b/device-common.mk
index 338f8be..2b3d236 100644
--- a/device-common.mk
+++ b/device-common.mk
@@ -839,7 +839,7 @@
 # Increment the SVN for any official public releases
 ifeq ($(PRODUCT_DEVICE_SVN_OVERRIDE),)
 PRODUCT_PROPERTY_OVERRIDES += \
-	ro.vendor.build.svn=19
+	ro.vendor.build.svn=20
 endif
 
 # Enable iwlan service logging for debug