msm: platsmp: Add smp support for MSM8909 SoC

Add the basic SMP support for MSM8909 target for 32-bit mode.

Enable initial hotplug support.

Snapshot of implementation is taken from msm-3.18 kernel version
@ commit bf9148fbb54a75 ("ARM: dts: msm: disable internal pull up
for 8909w BG").

Change-Id: Iafe8246ced297efecec98d5bb49c7538da4ddbc9
Signed-off-by: Sundara Vinayagam <sundvi@codeaurora.org>
Signed-off-by: Raja Mallik <rmallik@codeaurora.org>