arm64: dts: imx8mp: Fix power-domain typo

dt_binding_check detects an issue with the pgc_hsiomix power
domain:
  pgc: 'power-domains@17' does not match any of the regexes

This is because 'power-domains' should be 'power-domain'

Fixes: 2ae42e0 ("arm64: dts: imx8mp: add HSIO power-domains")
Signed-off-by: Adam Ford <[email protected]>
Reviewed-by: Laurent Pinchart <[email protected]>
Signed-off-by: Shawn Guo <[email protected]>

Author: aford173

arch/arm64/boot/dts/freescale/imx8mp.dtsi

@@ -591,7 +591,7 @@
 						reg = <IMX8MP_POWER_DOMAIN_MIPI_PHY2>;
 					};
 
-					pgc_hsiomix: power-domains@17 {
+					pgc_hsiomix: power-domain@17 {
 						#power-domain-cells = <0>;
 						reg = <IMX8MP_POWER_DOMAIN_HSIOMIX>;
 						clocks = <&clk IMX8MP_CLK_HSIO_AXI>,