msm: Fix warning in sensors ADSP driver with GCC 4.7 toolchain

Fixes below warning - could be potentially a bug as well.

arch/arm/mach-msm/sensors_adsp.c:877:39: warning: argument to 'sizeof' \
in 'memcpy' call is the same expression as the source; did you mean to \
dereference it? [-Wsizeof-pointer-memaccess]

Change-Id: I8e624b44120719d7359416a36912d0ef56f49982
Signed-off-by: Satya Durga Srinivasu Prabhala <satyap@codeaurora.org>