drivers: thermal: Print thermal temperature trace for userspace query

Print the thermal sensor temperature value in a new trace message. This
will print the temperature value read when it is queried via sysfs.

Change-Id: I7ff6859dcbea67ed068bae6b970d0e626ed0ec5b
Signed-off-by: Ram Chandrasekar <rkumbako@codeaurora.org>