msm: camera: Fix Dev contect issue on 32bit Kernel

LRME Driver context is derived using a 32bit shift.
32bit shift was leading to overflow on 32bit kernel
as context was stored in 32bit variable.

To resolve this we are storing device context on
second byte of the varaible and doing a shift by 16.

Change-Id: I9f6c013059947342068c14a1ceaa1b59fc0d1264
Signed-off-by: Chandan Gera <cgera@codeaurora.org>
Signed-off-by: Sridhar Gujje <sgujje@codeaurora.org>