ANDROID: thermal: Add a vendor hook for thermal throttle update

Commit 602c233f added a conditional for
ops->get_trip_temp(). In the original code,
ops->get_trip_temp() is called unconditionally. So delete
the conditional to fix it. At the same time, modify the
comment of enable. Actually, IPA is always enable, but
sometimes it needs to be disabled for a while. Making
'enable' true or false, IPA can be enabled or disabled by
user requirement.

When the 'override' turns to false from true and current
temperature is below the switch_on_temp(means 'update' is
false), the cooling device state has not changed, also
the power could not be updated to the maximum power. So
add a vendor hook to renew the 'update' value, so that the
cooling device can be updated.

Fixes: 602c233f ("ANDROID: thermal: Add a flag for vendor hook enable_thermal_power_throttle")
Bug: 271370056
Signed-off-by: Di Shen <di.shen@unisoc.com>
Change-Id: I43191926f8da9016fe76d7cb78639b1cbd89c53e