msm: kgsl: Don't error out if dst size is not equal to src in copy_prop

Update copy_prop to allow copy to a destination buffer of size greater
than or less the source buffer size. This is needed to correctly pass
gaming bin fuse value to user mode.

Change-Id: I1b651c79b9286c1259fbace815d58892462a7931
Signed-off-by: Deepak Kumar <dkumar@codeaurora.org>