ARM: dts: r8a7779: Use SYSC "always-on" PM Domain for HSCIF

Hook up HSCIF serial devices that are part of the CPG/MSTP Clock Domain
to the SYSC "always-on" PM Domain, for a more consistent
device-power-area description in DT.

Cfr. commit 751e29bb ("ARM: dts: r8a7779: Use SYSC "always-on"
PM Domain").

Fixes: 055d15a8 ("ARM: dts: r8a7779: Add HSCIF0/1 device nodes")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Reviewed-by: Ulrich Hecht <uli+renesas@fpond.eu>

arch/arm/boot/dts/r8a7779.dtsi

@@ -296,7 +296,7 @@ hscif0: serial@ffe48000 {
 			 <&cpg_clocks R8A7779_CLK_S>,
 			 <&scif_clk>;
 		clock-names = "fck", "brg_int", "scif_clk";
-		power-domains = <&cpg_clocks>;
+		power-domains = <&sysc R8A7779_PD_ALWAYS_ON>;
 		status = "disabled";
 	};
 
@@ -309,7 +309,7 @@ hscif1: serial@ffe49000 {
 			 <&cpg_clocks R8A7779_CLK_S>,
 			 <&scif_clk>;
 		clock-names = "fck", "brg_int", "scif_clk";
-		power-domains = <&cpg_clocks>;
+		power-domains = <&sysc R8A7779_PD_ALWAYS_ON>;
 		status = "disabled";
 	};