cpu: fix section mismatch warnings with __hotcpu_register

Upstream v.3.14.10+ drops the use of __cpuinit infrastructure.
"CPU hotplug: Provide lockless versions of callback registration
 functions", which fixes a legitimate ABBA deadlock is brought
in from v3.15.3-stable and introduces __hotcpu_register. Since
functions used as argument to this API are all annotated with
__cpuinit in msm-3.10, annotate __hotcpu_register with
__cpuinitdata to match this definition.

Change-Id: I69588fc780974a2a9b7c6d63b247aca2608d1c00
Signed-off-by: Osvaldo Banuelos <osvaldob@codeaurora.org>