keystone: kconfig: move board select menu and common settings

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

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

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Reviewed-by: Tom Rini <trini@ti.com>
Cc: Vitaly Andrianov <vitalya@ti.com>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 7a191c7..8ac16f9 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -337,11 +337,8 @@
 config TARGET_HIGHBANK
 	bool "Support highbank"
 
-config TARGET_K2E_EVM
-	bool "Support k2e_evm"
-
-config TARGET_K2HK_EVM
-	bool "Support k2hk_evm"
+config ARCH_KEYSTONE
+	bool "TI Keystone"
 
 config TARGET_M53EVK
 	bool "Support m53evk"
@@ -515,6 +512,8 @@
 
 source "arch/arm/cpu/armv7/exynos/Kconfig"
 
+source "arch/arm/cpu/armv7/keystone/Kconfig"
+
 source "arch/arm/cpu/arm926ejs/kirkwood/Kconfig"
 
 source "arch/arm/cpu/armv7/omap3/Kconfig"
@@ -656,7 +655,6 @@
 source "board/taskit/stamp9g20/Kconfig"
 source "board/ti/am335x/Kconfig"
 source "board/ti/am43xx/Kconfig"
-source "board/ti/ks2_evm/Kconfig"
 source "board/ti/ti814x/Kconfig"
 source "board/ti/ti816x/Kconfig"
 source "board/ti/tnetv107xevm/Kconfig"