riscv: dts: starfive: visionfive 2: correct spi's ss pin

The ss pin of spi0 is the same as sck pin. According to the
visionfive 2 documentation, it should be pin 49 instead of 48.

Fixes: 74fb20c8 ("riscv: dts: starfive: Add spi node and pins configuration")
Reviewed-by: Emil Renner Berthing <emil.renner.berthing@canonical.com>
Signed-off-by: Nam Cao <namcao@linutronix.de>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>

arch/riscv/boot/dts/starfive/jh7110-starfive-visionfive-2.dtsi

@@ -431,7 +431,7 @@ GPOEN_ENABLE,
 		};
 
 		ss-pins {
-			pinmux = <GPIOMUX(48, GPOUT_SYS_SPI0_FSS,
+			pinmux = <GPIOMUX(49, GPOUT_SYS_SPI0_FSS,
 					      GPOEN_ENABLE,
 					      GPI_SYS_SPI0_FSS)>;
 			bias-disable;