ARM: dts: aspeed-g6: add FWQSPI group in pinctrl dtsi

Add FWSPIDQ2 and FWSPIDQ3 group to support AST2600 FW SPI quad mode.
These pins can be used with dedicated FW SPI pins - FWSPICS0#,
FWSPICK, FWSPIMOSI and FWSPIMISO.
Signed-off-by: NJohnny Huang <johnny_huang@aspeedtech.com>
Signed-off-by: NJae Hyun Yoo <quic_jaehyoo@quicinc.com>
Reviewed-by: NAndrew Jeffery <andrew@aj.id.au>
Link: https://lore.kernel.org/r/20220329173932.2588289-7-quic_jaehyoo@quicinc.comSigned-off-by: NJoel Stanley <joel@jms.id.au>

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

@@ -117,6 +117,11 @@
 		groups = "FWSPID";
 	};
 
+	pinctrl_fwqspi_default: fwqspi_default {
+		function = "FWQSPI";
+		groups = "FWQSPI";
+	};
+
 	pinctrl_fwspiwp_default: fwspiwp_default {
 		function = "FWSPIWP";
 		groups = "FWSPIWP";