Revert "thermal/drivers/mellanox: Use generic thermal_zone_get_trip() function"

This reverts commit a71f3880.

Commit a71f3880 ("thermal/drivers/mellanox: Use generic
thermal_zone_get_trip() function") was backported as a dependency of the
fix in upstream commit 6d206b1e ("mlxsw: core_thermal: Fix fan speed
in maximum cooling state"). However, it is dependent on changes in the
thermal core that were merged in v6.3. Without them, the mlxsw driver is
unable to register its thermal zone:

mlxsw_spectrum 0000:03:00.0: Failed to register thermal zone
mlxsw_spectrum 0000:03:00.0: cannot register bus device
mlxsw_spectrum: probe of 0000:03:00.0 failed with error -22

Fix this by reverting this commit and instead fix the small conflict
with the above mentioned fix. Tested using the test case mentioned in
the change log of the fix:

 # cat /sys/class/thermal/thermal_zone2/cdev0/type
 mlxsw_fan
 # echo 10 > /sys/class/thermal/thermal_zone2/cdev0/cur_state
 # cat /sys/class/hwmon/hwmon1/name
 mlxsw
 # cat /sys/class/hwmon/hwmon1/pwm1
 255

After setting the fan to its maximum cooling state (10), it operates at
100% duty cycle instead of being stuck at 0 RPM.

Fixes: a71f3880 ("thermal/drivers/mellanox: Use generic thermal_zone_get_trip() function")
Reported-by: Joe Botha <joe@atomic.ac>
Tested-by: Joe Botha <joe@atomic.ac>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>