Bump PLATFORM_PREVIEW_SDK_VERSION to 2 for P-Beta1

Change-Id: Ic4e94c90fb1f86283858a88777a92ae75d6b65ed
Fixes: 77801171
Test: N/A
diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index d6bad21..f870896 100644
--- a/core/version_defaults.mk
+++ b/core/version_defaults.mk
@@ -167,7 +167,7 @@
     # assuming the device can only support APIs as of the previous official
     # public release.
     # This value will always be 0 for release builds.
-    PLATFORM_PREVIEW_SDK_VERSION := 1
+    PLATFORM_PREVIEW_SDK_VERSION := 2
   endif
 endif