arm: enable configurable thermal trips for ARCH_ARM targets

Thermal trips has to be configurable for userspace
thermal-engine to set thermal thresholds and get
thermal trip notifications.
Enable this by default for all ARCH_ARM based
targets.

Change-Id: Ie5afee21168162ad5c0a3bad399533be8f7ccd9b
Signed-off-by: Ram Chandrasekar <rkumbako@codeaurora.org>