msm: camera2: cpp: Fix to correct pointer in copy_to_user call

Deferencing user pointer in kernel code is incorrect. This code
can cause kernel panic for some rare cases. Use kernel pointer
while calling copy_to_user() API.

Change-Id: I3500fa19adb9a6791540fa73023df9011242b243
Signed-off-by: Krishna Srinivas Kundurthi <krisri@codeaurora.org>