omap4: kconfig: move board select menu and common settings

Becuase the board select menu in arch/arm/Kconfig is too big,
move the OMAP4 board select menu to omap4/Kconfig.

Move also common settings (CONFIG_SYS_CPU="armv7" and
CONFIG_SYS_SOC="omap4").

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Reviewed-by: Tom Rini <trini@ti.com>
Cc: Lokesh Vutla <lokeshvutla@ti.com>
diff --git a/arch/arm/cpu/armv7/omap4/Kconfig b/arch/arm/cpu/armv7/omap4/Kconfig
new file mode 100644
index 0000000..20d2c11
--- /dev/null
+++ b/arch/arm/cpu/armv7/omap4/Kconfig
@@ -0,0 +1,29 @@
+if OMAP44XX
+
+choice
+	prompt "OMAP4 board select"
+
+config TARGET_DUOVERO
+	bool "OMAP4430 Gumstix Duovero"
+
+config TARGET_OMAP4_PANDA
+	bool "TI OMAP4 PandaBoard"
+
+config TARGET_OMAP4_SDP4430
+	bool "TI OMAP4 SDP4430"
+
+endchoice
+
+config SYS_CPU
+	string
+	default "armv7"
+
+config SYS_SOC
+	string
+	default "omap4"
+
+source "board/gumstix/duovero/Kconfig"
+source "board/ti/panda/Kconfig"
+source "board/ti/sdp4430/Kconfig"
+
+endif