thermal: fix section mismatch warning
fixes -
WARNING: vmlinux.o(.text+0x53697c): Section mismatch in reference from the function check_temp() to the function .cpuinit.text:cpu_up()
The function check_temp() references
the function __cpuinit cpu_up().
This is often because check_temp lacks a __cpuinit
annotation or the annotation of cpu_up is wrong.

Signed-off-by: Luis Cruz <ljc2491@gmail.com>