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/mpc824x/Kconfig b/arch/powerpc/cpu/mpc824x/Kconfig
new file mode 100644
index 0000000..309833f
--- /dev/null
+++ b/arch/powerpc/cpu/mpc824x/Kconfig
@@ -0,0 +1,49 @@
+menu "mpc824x CPU"
+	depends on MPC824X
+
+config SYS_CPU
+	string
+	default "mpc824x"
+
+choice
+	prompt "Target select"
+
+config TARGET_A3000
+	bool "Support A3000"
+
+config TARGET_CPC45
+	bool "Support CPC45"
+
+config TARGET_CU824
+	bool "Support CU824"
+
+config TARGET_EXALION
+	bool "Support eXalion"
+
+config TARGET_MUSENKI
+	bool "Support MUSENKI"
+
+config TARGET_MVBLUE
+	bool "Support MVBLUE"
+
+config TARGET_SANDPOINT8240
+	bool "Support Sandpoint8240"
+
+config TARGET_SANDPOINT8245
+	bool "Support Sandpoint8245"
+
+config TARGET_UTX8245
+	bool "Support utx8245"
+
+endchoice
+
+source "board/a3000/Kconfig"
+source "board/cpc45/Kconfig"
+source "board/cu824/Kconfig"
+source "board/eXalion/Kconfig"
+source "board/musenki/Kconfig"
+source "board/mvblue/Kconfig"
+source "board/sandpoint/Kconfig"
+source "board/utx8245/Kconfig"
+
+endmenu