Add fixupAppDir() API.

This can be used to fixup application directories in case they have been
created by some other entity besides vold; the main use case for this
API right now is OBB directories, which can be created by installers
outside of vold; on devices without sdcardfs, such directories and the
files contained therein are not setup correctly. This API will make sure
everything is setup the way it needs to be setup.

Bug: 146419093
Test: inspect OBB dir after install
Change-Id: I2e35b7ac2992dbb21cc950e53651ffc07cfca907
diff --git a/VoldNativeService.h b/VoldNativeService.h
index 6d00d2d..e04c259 100644
--- a/VoldNativeService.h
+++ b/VoldNativeService.h
@@ -66,6 +66,7 @@
     binder::Status remountUid(int32_t uid, int32_t remountMode);
 
     binder::Status setupAppDir(const std::string& path, int32_t appUid);
+    binder::Status fixupAppDir(const std::string& path, int32_t appUid);
 
     binder::Status createObb(const std::string& sourcePath, const std::string& sourceKey,
                              int32_t ownerGid, std::string* _aidl_return);