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 751e29bbb64ad091 ("ARM: dts: r8a7779: Use SYSC "always-on"
PM Domain").

Fixes: 055d15a88f66b096 ("ARM: dts: r8a7779: Add HSCIF0/1 device nodes")
Signed-off-by: Geert Uytterhoeven <[e-mail]>
Reviewed-by: Simon Horman <[e-mail]>
Reviewed-by: Ulrich Hecht <[e-mail]>

arch/arm/boot/dts/r8a7779.dtsi

···
 			 <&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";
 	};
 
···
 			 <&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";
 	};