soc: renesas: r8a77980-sysc: Fix power request conflicts

Describe the location and contents of the SYSCEXTMASK register on R-Car
V3H, to prevent conflicts between internal and external power requests.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Link: https://lore.kernel.org/r/20190828113618.6672-7-geert+renesas@glider.be

drivers/soc/renesas/r8a77980-sysc.c

@@ -6,6 +6,7 @@
  * Copyright (C) 2018 Cogent Embedded, Inc.
  */
 
+#include <linux/bits.h>
 #include <linux/bug.h>
 #include <linux/kernel.h>
 
@@ -49,4 +50,6 @@ static const struct rcar_sysc_area r8a77980_areas[] __initconst = {
 const struct rcar_sysc_info r8a77980_sysc_info __initconst = {
 	.areas = r8a77980_areas,
 	.num_areas = ARRAY_SIZE(r8a77980_areas),
+	.extmask_offs = 0x138,
+	.extmask_val = BIT(0),
 };