msm: thermal: Replace __cpuinit with __ref to support non smp

__cpuinit is causing issues on non smp targets and it also leads to
compilation issues if __cpuinit is completely removed on smp targets
as modpost will complain for calling removable sections from non
removable sections. Replace __cpuinit data with __ref which will
silence the modpost and works fine for non smp targets as well.

Change-Id: Ifa413f6708935b1dcae9438bf39a194372eb0c61
Signed-off-by: Anji Jonnala <anjir@codeaurora.org>