[][MT7986a: Add pwm fan support and example cooling strategies]

[Description]
Add pwm fan support to mt7986a
example cooling strategies:
x~40 : FAN 0%
40~60: FAN 50%
60~x : FAN 100%

Need to set 'pwms' and 'status' properties in dts to enable this feature

[Release-log]
N/A

Change-Id: I220756e5ac8e154251943ca5d6a0303846b40190
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/6027380
1 file changed