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/board/keymile/km82xx/Kconfig b/board/keymile/km82xx/Kconfig
new file mode 100644
index 0000000..c29032a
--- /dev/null
+++ b/board/keymile/km82xx/Kconfig
@@ -0,0 +1,15 @@
+if TARGET_KM82XX
+
+config SYS_BOARD
+	string
+	default "km82xx"
+
+config SYS_VENDOR
+	string
+	default "keymile"
+
+config SYS_CONFIG_NAME
+	string
+	default "km82xx"
+
+endif
diff --git a/board/keymile/km83xx/Kconfig b/board/keymile/km83xx/Kconfig
new file mode 100644
index 0000000..934c45d
--- /dev/null
+++ b/board/keymile/km83xx/Kconfig
@@ -0,0 +1,47 @@
+if TARGET_KM8360
+
+config SYS_BOARD
+	string
+	default "km83xx"
+
+config SYS_VENDOR
+	string
+	default "keymile"
+
+config SYS_CONFIG_NAME
+	string
+	default "km8360"
+
+endif
+
+if TARGET_SUVD3
+
+config SYS_BOARD
+	string
+	default "km83xx"
+
+config SYS_VENDOR
+	string
+	default "keymile"
+
+config SYS_CONFIG_NAME
+	string
+	default "suvd3"
+
+endif
+
+if TARGET_TUXX1
+
+config SYS_BOARD
+	string
+	default "km83xx"
+
+config SYS_VENDOR
+	string
+	default "keymile"
+
+config SYS_CONFIG_NAME
+	string
+	default "tuxx1"
+
+endif
diff --git a/board/keymile/km_arm/Kconfig b/board/keymile/km_arm/Kconfig
new file mode 100644
index 0000000..dec4626
--- /dev/null
+++ b/board/keymile/km_arm/Kconfig
@@ -0,0 +1,23 @@
+if TARGET_KM_KIRKWOOD
+
+config SYS_CPU
+	string
+	default "arm926ejs"
+
+config SYS_BOARD
+	string
+	default "km_arm"
+
+config SYS_VENDOR
+	string
+	default "keymile"
+
+config SYS_SOC
+	string
+	default "kirkwood"
+
+config SYS_CONFIG_NAME
+	string
+	default "km_kirkwood"
+
+endif
diff --git a/board/keymile/kmp204x/Kconfig b/board/keymile/kmp204x/Kconfig
new file mode 100644
index 0000000..0236f69
--- /dev/null
+++ b/board/keymile/kmp204x/Kconfig
@@ -0,0 +1,15 @@
+if TARGET_KMP204X
+
+config SYS_BOARD
+	string
+	default "kmp204x"
+
+config SYS_VENDOR
+	string
+	default "keymile"
+
+config SYS_CONFIG_NAME
+	string
+	default "kmp204x"
+
+endif