riscv: dts: starfive: jh7110: Add PLL clocks source in SYSCRG node

Add PLL clocks input from PLL clocks driver in SYSCRG node.

Reviewed-by: Emil Renner Berthing <emil.renner.berthing@canonical.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Xingyu Wu <xingyu.wu@starfivetech.com>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>