arm64: 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.

CRs-Fixed: 895850
Change-Id: Id33041a06d5f4408ca7b677eee4a52dd39620782
Signed-off-by: Ram Chandrasekar <rkumbako@codeaurora.org>