msm: platsmp: snapshot of the smp ops

Add smp related files like platsmp, headsmp and
hotplug. Copied from the below caf link
https://www.codeaurora.org/cgit/quic/la/kernel/msm-3.18/


tree/arch/arm/mach-msm?h=caf/3.10/msm-3.10
&id=5724b421fc2db7413048fe5b18135d481d68597a

Change-Id: I2b0be05f939dd97efa6bd187f65f6805d73cb64e
Signed-off-by: Venkatesh Yadav Abbarapu <vabbar@codeaurora.org>