[U-Boot] build: define CPU only when arch/${ARCH}/cpu/${CPU} exists

[Tom Rini]

On Tue, Jun 24, 2014 at 10:10:52PM +0900, Masahiro Yamada wrote:

> The directory arch/${ARCH}/cpu/${CPU} does not exist
> in avr32, blackfin, microblaze, nios2, openrisc, sandbox, x86.
> 
> These architectures have only one CPU type.
> Defining CPU should not be required for such architectures.
> 
> This commit allows cpu field (= the 3rd field of boards.cfg)
> to be kept blank.
> 
> Signed-off-by: Masahiro Yamada <yamada.m at jp.panasonic.com>
> Cc: Andreas Bießmann <andreas.devel at googlemail.com>
> Cc: Simon Glass <sjg at chromium.org>
> Cc: Sonic Zhang <sonic.zhang at analog.com>
> Cc: Michal Simek <michal.simek at xilinx.com>
> Cc: Thomas Chou <thomas at wytron.com.tw>
> Cc: Stefan Kristiansson <stefan.kristiansson at saunalahti.fi>

Applied to u-boot/master, thanks!

-- 
Tom
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