[Buildroot] Make the top rule %_defconfig work

[Hans-Christian Egtvedt <hcegtvedt@norway.atmel.com>]

Hi,

Please see the included patch as a comment to the earlier discussion
about having _defconfig. By only searching the target/ directory it will
not conflict with the extracted kernel and similar.

It makes the most sense to be able to load a BR2 <board>_defconfig from
the target directory. What this build target does is to overwrite
the .config with a premade default configuration.

For example as a hardware (and software) provider I would like to be
able to build a "standard" image having a collection of applications
useful for the board.

-- 
Mvh
Hans-Christian Egtvedt
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