drivers: thermal: cpu_isolate: Add a snapshot of cpu isolate

This is a snapshot of the cpu isolate cooling device driver from
msm-4.19 to msm-5.4 as of 'commit
<5069a29e82b3c83577a2bde5739f603750db5e89> (drivers: thermal:
validate cdev sysfs cur_state request before using it)'.

Change-Id: I046d38f76bb8bcf5cfd0f2b03a166611fad955f0
Signed-off-by: Ram Chandrasekar <rkumbako@codeaurora.org>