Update lynx SVN to 21 am: 86a5650a25 am: 80556bb306

Original change: https://googleplex-android-review.googlesource.com/c/device/google/lynx/+/24896514

Change-Id: I2f33b749fb17025fee529b0caf04c5e82d3ba605
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

device-lynx.mk

@@ -206,7 +206,7 @@ PRODUCT_VENDOR_PROPERTIES += \
 
 # Increment the SVN for any official public releases
 PRODUCT_VENDOR_PROPERTIES += \
-    ro.vendor.build.svn=20
+    ro.vendor.build.svn=21
 
 # Set support hide display cutout feature
 PRODUCT_PRODUCT_PROPERTIES += \