Diff source dump and current version dump for Cross-Version ABI Check

In the newly proposed Cross-Verison ABI Check, the path of dump that
LLNDK, NDK and mainline reference to is changed to:
Before finalization: current/
After finalization: {PLATFORM_SDK_VERSION}/
In addition, a related CL(aosp/2147882) modifies the script to create
dump to folders that match the current finalization stage.

Test: make libbinder_ndk
Bug: 238387082
Change-Id: I92a4a52c26c85cf4c866b441e54291c6a624fbf4