Allowing the ModemService write access to the sysfs attribute
cp_temp which is used to update the thermal zones.
Test: Verified sysfs attribute security labels
Bug: 267485434
Change-Id: I8361e53f4e6aa82e6dc78e94af71ee26c06fb2f5
Signed-off-by: Mahesh Kallelil <kallelil@google.com>