Revert "RESTRICT AUTOMERGE Updating the platform sdk version for Q"

This reverts commit 5e0226b816c2d182b5dcf24ac65a8fbd550c81de.

Reason for revert: QT SDK Finalization. Will be merged again on/after May 13th

Bug: 129975435
Change-Id: Ia3693b2a4907c4ca9be56cfe18fda35b8545abba
diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index 8b43a7d..70fc57a 100644
--- a/core/version_defaults.mk
+++ b/core/version_defaults.mk
@@ -121,7 +121,7 @@
   # When you increment the PLATFORM_SDK_VERSION please ensure you also
   # clear out the following text file of all older PLATFORM_VERSION's:
   # cts/tests/tests/os/assets/platform_versions.txt
-  PLATFORM_SDK_VERSION := 29
+  PLATFORM_SDK_VERSION := 28
 endif
 .KATI_READONLY := PLATFORM_SDK_VERSION