ARM: dts: aspeed-g6: fix SPI1/SPI2 quad pin group

Fix incorrect function mappings in pinctrl_qspi1_default and
pinctrl_qspi2_default since their function should be SPI1 and
SPI2 respectively.

Fixes: f510f04c8c83 ("ARM: dts: aspeed: Add AST2600 pinmux nodes")
Signed-off-by: Jae Hyun Yoo <[e-mail]>
Reviewed-by: Andrew Jeffery <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Joel Stanley <[e-mail]>

arch/arm/boot/dts/aspeed-g6-pinctrl.dtsi

···
 	};
 
 	pinctrl_qspi1_default: qspi1_default {
-		function = "QSPI1";
+		function = "SPI1";
 		groups = "QSPI1";
 	};
 
 	pinctrl_qspi2_default: qspi2_default {
-		function = "QSPI2";
+		function = "SPI2";
 		groups = "QSPI2";
 	};