Bump SDK Extension version to 9

This bump includes adServices.

Bug: 294222367
Test: The build passes
Ignore-AOSP-first: Finalization is not performed in AOSP

Change-Id: Ifd08720db98a36e8140b3b2e10b710c531a456b4
diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index c5a7f42..5470a47 100644
--- a/core/version_defaults.mk
+++ b/core/version_defaults.mk
@@ -79,7 +79,7 @@
 .KATI_READONLY := PLATFORM_SDK_VERSION
 
 # This is the sdk extension version of this tree.
-PLATFORM_SDK_EXTENSION_VERSION := 8
+PLATFORM_SDK_EXTENSION_VERSION := 9
 .KATI_READONLY := PLATFORM_SDK_EXTENSION_VERSION
 
 # This is the sdk extension version that PLATFORM_SDK_VERSION ships with.