ANDROID: sdcardfs: Don't use OVERRIDE_CRED macro

The macro hides some control flow, making it easier
to run into bugs.

bug: 111642636

Change-Id: I37ec207c277d97c4e7f1e8381bc9ae743ad78435
Reported-by: Jann Horn <jannh@google.com>
Signed-off-by: Daniel Rosenberg <drosen@google.com>
Git-repo: https://android.googlesource.com/kernel/msm


Git-commit: c17e2d402c61d1738cb2fbccf4c29ae85279509c
Signed-off-by: Dennis Cagle <dcagle@codeaurora.org>