ARM: dts: armada388-helios4: assign pinctrl to each fan

Split up the pins for each fan. This is needed in order to control them

Fixes: ced8025b ("ARM: dts: armada388-helios4")

Signed-off-by: Rosen Penev <rosenp@gmail.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>