Prevent heap overflow in uvc driver

The size of uvc_control_mapping is user controlled leading to a
potential heap overflow in the uvc driver. This adds a check to verify
the user provided size fits within the bounds of the defined buffer
size.

Bug: 33300353
Change-Id: If29c1b396633b6137966a12e38f6fd1841b045bd
Signed-off-by: Robb Glasser <rglasser@google.com>
Git-repo: https://android.googlesource.com/kernel/msm


Git-commit: 8bc3ec72a02052187397d0de1a7b8bbe7340451c
Signed-off-by: Dennis Cagle <d-cagle@codeaurora.org>