soc: renesas: rcar-sysc: Move SYSC interrupt config to rcar-sysc driver

On R-Car H1 and Gen2, the SYSC interrupt registers are always configured
using hardcoded values in platform code. For R-Car Gen2, values are
provided for H2 and M2-W only, other SoCs are not yet supported, and
never will be.

Move this configuration from SoC-specific platform code to the
rcar_sysc_init() wrapper, so it can be skipped if the SYSC is configured
from DT. This would be the case not only for H1, H2, and M2-W using a
modern DTS, but also for other R-Car Gen2 SoCs not supported by the
platform code, relying purely on DT.

There is no longer a need to return the mapped register block, hence
make the function return void.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Ulrich Hecht <ulrich.hecht+renesas@gmail.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/mach-shmobile/pm-r8a7779.c

@@ -23,11 +23,7 @@
 
 static void __init r8a7779_sysc_init(void)
 {
-	void __iomem *base = rcar_sysc_init(0xffd85000);
-
-	/* enable all interrupt sources, but do not use interrupt handler */
-	iowrite32(0x0131000e, base + SYSCIER);
-	iowrite32(0, base + SYSCIMR);
+	rcar_sysc_init(0xffd85000, 0x0131000e);
 }
 
 #else /* CONFIG_PM || CONFIG_SMP */

arch/arm/mach-shmobile/pm-rcar-gen2.c

@@ -37,11 +37,7 @@
 
 static void __init rcar_gen2_sysc_init(u32 syscier)
 {
-	void __iomem *base = rcar_sysc_init(0xe6180000);
-
-	/* enable all interrupt sources, but do not use interrupt handler */
-	iowrite32(syscier, base + SYSCIER);
-	iowrite32(0, base + SYSCIMR);
+	rcar_sysc_init(0xe6180000, syscier);
 }
 
 #else /* CONFIG_SMP */