msm: 8910: add smp support for 8910

The target cannot be added to the common platsmp file due to CPU
differences. Add new platsmp file along with support to build
that file.

Change-Id: Id0880507d099036951c3737e67341f634681e455
Signed-off-by: Syed Rameez Mustafa <rameezmustafa@codeaurora.org>