consolidating playground androidx-plugin with buildSrc

this turns playground back into using buildSrc and makes it easier to keep in sync when the main buildSrc changes

Bug: 140265324

Test: rm out -rf && ./gradlew :help && ls ../../out out # and see that ../../out exists but ./out/ doesn't exist

Test: Treehugger runs busytown/androidx.sh

Test: cd paging && ./gradlew compileDebugKotlin
Test: cd paging && ./gradlew checkApi
Test: cd biometric && ./gradlew compileDebugKotlin
Test: cd compose/compiler && ./gradlew compileDebugKotlin

Change-Id: I2fc191281a032352b3e99a284c2d2df24ea0dcda
diff --git a/playground-common/setup-playground.sh b/playground-common/setup-playground.sh
index e7430953..73849fa 100755
--- a/playground-common/setup-playground.sh
+++ b/playground-common/setup-playground.sh
@@ -19,6 +19,8 @@
 ln -s "${PLAYGROUND_REL_PATH}/gradlew.bat" gradlew.bat
 rm -rf gradle.properties
 ln -s "${PLAYGROUND_REL_PATH}/androidx-shared.properties" gradle.properties
+rm -rf buildSrc
+ln -s "${PLAYGROUND_REL_PATH}/../buildSrc" buildSrc
 
 ANDROIDX_IDEA_DIR="${PLAYGROUND_REL_PATH}/../.idea"
 
@@ -45,4 +47,4 @@
     ln -s $REL_PATH $IDEA_CONFIG_FILE
     # forse add the file to git
     git add -f $IDEA_CONFIG_FILE
-done
\ No newline at end of file
+done