ARM: rmobile: Factor out SYS_SOC Kconfig option

Pull the SYS_SOC Kconfig option to avoid duplication of this option
in Kconfig.{32,64,rza1} . The default value is the same, so just set
it in one location.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
diff --git a/arch/arm/mach-rmobile/Kconfig b/arch/arm/mach-rmobile/Kconfig
index 9ff45f4..b69ccae 100644
--- a/arch/arm/mach-rmobile/Kconfig
+++ b/arch/arm/mach-rmobile/Kconfig
@@ -41,6 +41,9 @@
 
 endchoice
 
+config SYS_SOC
+	default "rmobile" if ARCH_RMOBILE
+
 source "arch/arm/mach-rmobile/Kconfig.32"
 source "arch/arm/mach-rmobile/Kconfig.64"
 source "arch/arm/mach-rmobile/Kconfig.rza1"
diff --git a/arch/arm/mach-rmobile/Kconfig.32 b/arch/arm/mach-rmobile/Kconfig.32
index 31badc5..1ac31c2 100644
--- a/arch/arm/mach-rmobile/Kconfig.32
+++ b/arch/arm/mach-rmobile/Kconfig.32
@@ -125,9 +125,6 @@
 config TMU_TIMER
 	bool
 
-config SYS_SOC
-	default "rmobile"
-
 config RMOBILE_EXTRAM_BOOT
 	bool "Enable boot from RAM"
 	depends on TARGET_ALT || TARGET_BLANCHE || TARGET_KOELSCH || TARGET_LAGER || TARGET_PORTER || TARGET_SILK || TARGET_STOUT
diff --git a/arch/arm/mach-rmobile/Kconfig.64 b/arch/arm/mach-rmobile/Kconfig.64
index 33fd776..3ed5099 100644
--- a/arch/arm/mach-rmobile/Kconfig.64
+++ b/arch/arm/mach-rmobile/Kconfig.64
@@ -172,9 +172,6 @@
 
 endchoice
 
-config SYS_SOC
-	default "rmobile"
-
 source "board/renesas/condor/Kconfig"
 source "board/renesas/draak/Kconfig"
 source "board/renesas/eagle/Kconfig"
diff --git a/arch/arm/mach-rmobile/Kconfig.rza1 b/arch/arm/mach-rmobile/Kconfig.rza1
index 8cf033f..e88f9a2 100644
--- a/arch/arm/mach-rmobile/Kconfig.rza1
+++ b/arch/arm/mach-rmobile/Kconfig.rza1
@@ -19,9 +19,6 @@
 
 endchoice
 
-config SYS_SOC
-	default "rmobile"
-
 # Renesas Supported Boards
 source "board/renesas/grpeach/Kconfig"