msm: camera: Fix out-of-bounds read in string class name.

jpeg driver is calling class_create with stack variable, which
can be overwritten by other stack variables.

Change-Id: I3c22a5b3375b970ff6b1c6de983dd5833f4e11d0
Signed-off-by: Trishansh Bhardwaj <tbhardwa@codeaurora.org>
Signed-off-by: VijayaKumar T M <vtmuni@codeaurora.org>