pinctrl: starfive: Add StarFive JH7110 driver

Add pinctrl driver for StarFive JH7110 SoC.

Signed-off-by: Kuan Lim Lee <kuanlim.lee@linux.starfivetech.com>
Signed-off-by: Emil Renner Berthing <kernel@esmil.dk>
Signed-off-by: Jianlong Huang <jianlong.huang@starfivetech.com>
Signed-off-by: Yanhong Wang <yanhong.wang@starfivetech.com>
Tested-by: Conor Dooley <conor.dooley@microchip.com>