arm64: dts: clearfog-gt-8k: fix SGMII PHY reset signal

The PHY reset signal goes to mpp43 on CP0.

Fixes: babc5544

 ("arm64: dts: clearfog-gt-8k: 1G eth PHY reset signal")
Reported-by: Denis Odintsov <oversun@me.com>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>