Revert "fix corrupted smc_fastcall returned error code TBUG-464"

This reverts commit 64517d01.

Revert change prior to re-submitting with the correct author.

Change-Id: I9cf956d32105ab48a2f9d396d498fa4c44860e71
Signed-off-by: Keith Fallows <keithf@codeaurora.org>