arm: dts: imx: fsl-imx8qm.dtsi: add gpio aliases to fix gpio command

The gpio command currently uses equal bank names "GPIO0_"
for all existing gpio banks, i. e.:

U-Boot# gpio status -a
Bank GPIO0_:
GPIO0_0: input: 0 [ ]
GPIO0_1: input: 0 [ ]
...

Bank GPIO0_:
GPIO0_0: input: 0 [ ]
GPIO0_1: input: 0 [ ]
    ...

So the command is broken, it is not possible to address
a desired bank. Add gpio aliases to fix this.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Anatolij Gustschin <agust@denx.de>

arch/arm/dts/fsl-imx8qm.dtsi

@@ -21,6 +21,13 @@
 	aliases {
 		ethernet0 = &fec1;
 		ethernet1 = &fec2;
+		gpio0 = &gpio1;
+		gpio1 = &gpio2;
+		gpio2 = &gpio3;
+		gpio3 = &gpio4;
+		gpio4 = &gpio5;
+		gpio5 = &gpio6;
+		gpio6 = &gpio7;
 		serial0 = &lpuart0;
 		serial1 = &lpuart1;
 		serial2 = &lpuart2;