This patch enabled out-of-tree builds for u-boot. This also helps building
u-boot using EXTERNALSRC flow
(From OE-Core rev: 36f110594506fbee5dc18de3a04981f019f2024d)
Signed-off-by: Manjukumar Matha <manjukumar.harthikote-matha@xilinx.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>