msm: mink: Fix copy_to_user issue

Fix buffer copy issue encountered during arguments copy
from user space to kernel and vice versa. This also fixes
compilation errors which were triggered after enabling
smcinvoke driver for targets which has 32bit architecture.

Change-Id: I5ecd7d7b91cd42fdbed62c9c8fbf6bba11a9d76c
Signed-off-by: AnilKumar Chimata <anilc@codeaurora.org>