nomadik: kconfig: move board select menu and common settings

Becuase the board select menu in arch/arm/Kconfig is too big,
move the Nomadik board select menu to nomadik/Kconfig.

Move also common settings (CONFIG_SYS_CPU="arm926ejs" and
CONFIG_SYS_SOC="nomadik").

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
diff --git a/arch/arm/cpu/arm926ejs/nomadik/Kconfig b/arch/arm/cpu/arm926ejs/nomadik/Kconfig
new file mode 100644
index 0000000..7177800
--- /dev/null
+++ b/arch/arm/cpu/arm926ejs/nomadik/Kconfig
@@ -0,0 +1,21 @@
+if ARCH_NOMADIK
+
+choice
+	prompt "Nomadik board select"
+
+config NOMADIK_NHK8815
+	bool "ST 8815 Nomadik Hardware Kit"
+
+endchoice
+
+config SYS_CPU
+	string
+	default "arm926ejs"
+
+config SYS_SOC
+	string
+	default "nomadik"
+
+source "board/st/nhk8815/Kconfig"
+
+endif