Update Sunfish SVN to 15 am: 60869c86b8

Original change: https://googleplex-android-review.googlesource.com/c/device/google/sunfish/+/12617774

Change-Id: I2af7e950a7bb3e01e61dfeb1bac4b0e6cf3100f3
diff --git a/device.mk b/device.mk
index bcdb0cf..9ee0bd6 100644
--- a/device.mk
+++ b/device.mk
@@ -878,7 +878,7 @@
 
 # Increment the SVN for any official public releases
 PRODUCT_PROPERTY_OVERRIDES += \
-	ro.vendor.build.svn=14
+	ro.vendor.build.svn=15
 
 # ZRAM writeback
 PRODUCT_PROPERTY_OVERRIDES += \