kbuild: add KBUILD_DEFCONFIG
This allows "make ARCH=... defconfig".

Fox example, you can type "make defconfig" instead of
"make sandbox_defconfig".

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
1 parent 6388cfd commit 78582e53dcb2c6f42282ddf27b66e5bc5b7202cc
@Masahiro Yamada Masahiro Yamada authored on 13 Jan 2015
Sascha Hauer committed on 14 Jan 2015
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arch/efi/Makefile
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arch/sandbox/Makefile
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arch/x86/Makefile