kconfig: add board Kconfig and defconfig files

This commit adds:
 - arch/${ARCH}/Kconfig
    provide a menu to select target boards
 - board/${VENDOR}/${BOARD}/Kconfig or board/${BOARD}/Kconfig
    set CONFIG macros to the appropriate values for each board
 - configs/${TARGET_BOARD}_defconfig
    default setting of each board

(This commit was automatically generated by a conversion script
based on boards.cfg)

In Linux Kernel, defconfig files are located under
arch/${ARCH}/configs/ directory.
It works in Linux Kernel since ARCH is always given from the
command line for cross compile.

But in U-Boot, ARCH is not given from the command line.
Which means we cannot know ARCH until the board configuration is done.
That is why all the "*_defconfig" files should be gathered into a
single directory ./configs/.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/powerpc/cpu/mpc8260/Kconfig b/arch/powerpc/cpu/mpc8260/Kconfig
new file mode 100644
index 0000000..1a8707d
--- /dev/null
+++ b/arch/powerpc/cpu/mpc8260/Kconfig
@@ -0,0 +1,94 @@
+menu "mpc8260 CPU"
+	depends on MPC8260
+
+config SYS_CPU
+	string
+	default "mpc8260"
+
+choice
+	prompt "Target select"
+
+config TARGET_ATC
+	bool "Support atc"
+
+config TARGET_COGENT_MPC8260
+	bool "Support cogent_mpc8260"
+
+config TARGET_CPU86
+	bool "Support CPU86"
+
+config TARGET_CPU87
+	bool "Support CPU87"
+
+config TARGET_EP8260
+	bool "Support ep8260"
+
+config TARGET_EP82XXM
+	bool "Support ep82xxm"
+
+config TARGET_GW8260
+	bool "Support gw8260"
+
+config TARGET_HYMOD
+	bool "Support hymod"
+
+config TARGET_IPHASE4539
+	bool "Support IPHASE4539"
+
+config TARGET_MUAS3001
+	bool "Support muas3001"
+
+config TARGET_PM826
+	bool "Support PM826"
+
+config TARGET_PM828
+	bool "Support PM828"
+
+config TARGET_PPMC8260
+	bool "Support ppmc8260"
+
+config TARGET_SACSNG
+	bool "Support sacsng"
+
+config TARGET_MPC8266ADS
+	bool "Support MPC8266ADS"
+
+config TARGET_VOVPN_GW
+	bool "Support VoVPN-GW"
+
+config TARGET_IDS8247
+	bool "Support IDS8247"
+
+config TARGET_KM82XX
+	bool "Support km82xx"
+
+config TARGET_TQM8260
+	bool "Support TQM8260"
+
+config TARGET_TQM8272
+	bool "Support TQM8272"
+
+endchoice
+
+source "board/atc/Kconfig"
+source "board/cogent/Kconfig"
+source "board/cpu86/Kconfig"
+source "board/cpu87/Kconfig"
+source "board/ep8260/Kconfig"
+source "board/ep82xxm/Kconfig"
+source "board/freescale/mpc8266ads/Kconfig"
+source "board/funkwerk/vovpn-gw/Kconfig"
+source "board/gw8260/Kconfig"
+source "board/hymod/Kconfig"
+source "board/ids/ids8247/Kconfig"
+source "board/iphase4539/Kconfig"
+source "board/keymile/km82xx/Kconfig"
+source "board/muas3001/Kconfig"
+source "board/pm826/Kconfig"
+source "board/pm828/Kconfig"
+source "board/ppmc8260/Kconfig"
+source "board/sacsng/Kconfig"
+source "board/tqc/tqm8260/Kconfig"
+source "board/tqc/tqm8272/Kconfig"
+
+endmenu