thermal: rockchip: handle the power sequence for rk3399 SoCs

thermal: rockchip: handle the power sequence for rk3399 SoCs

This adds the grf property to handle the tsadc power sequence on
rk3399 SoCs.

The rk3399 tsadc can work with this patch on now.

while true; do grep "" /sys/class/thermal/thermal_zone[0-1]/temp;sleep .5; done
/sys/class/thermal/thermal_zone0/temp:40555
/sys/class/thermal/thermal_zone1/temp:41111
/sys/class/thermal/thermal_zone0/temp:40555
/sys/class/thermal/thermal_zone1/temp:41111
/sys/class/thermal/thermal_zone0/temp:40555
/sys/class/thermal/thermal_zone1/temp:41666
/sys/class/thermal/thermal_zone0/temp:40555
/sys/class/thermal/thermal_zone1/temp:41111
/sys/class/thermal/thermal_zone0/temp:40555
/sys/class/thermal/thermal_zone1/temp:41111
/sys/class/thermal/thermal_zone0/temp:40555

Change-Id: I0155826bddf0017ea4985920268b333a20278bbe
Signed-off-by: Caesar Wang <wxt@rock-chips.com>