msm: thermal: fix init with msm_thermal

 * not using ioctl interface for this in-kernel solution
so prevent msm_thermal-dev to be built
 * use higher frequency points than my N5 driver because
Bacon rarely gets really hot so we don't need to throttle
as heavy
 * re-structure init->register<->exit flow compared to the
N5 code. We don't rely on board init call anymore. Besides
externs are fugly. The rest is on the msm_thermal merge side

Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>

Change-Id: Ie94358f1f031016ba899f5a17228c26cfb4785ab