msm: pm-8x60: Move hotplug related code out of pm code.

Move hotplug related code into hotplug.c and compile hotplug.c only when
CONFIG_HOTPLUG_CPU is defined.

Signed-off-by: Mahesh Sivasubramanian <msivasub@codeaurora.org>
Change-Id: Ia9aa7a64e9831f52431c77c22f30fb64892efaea
6 files changed