[U-Boot] linux/compat.h: add dev_warn()

[Andreas Bießmann]

Dear =?utf-8?q?Andreas_Bie=C3=9Fmann?=,

<andreas at biessmann.org> writes:
>In order to prevent build errors for copied code from linux introduce
>dev_warn().
>
>Suggested-by: Scott Wood <oss at buserror.net>
>Signed-off-by: Andreas Bießmann <andreas at biessmann.org>
>Acked-by: Simon Glass <sjg at chromium.org>
>---
>This is a replacement patch for '[PATCH v2 14/18] at91: mtd: nand: Add
>dev_warn() to correct build error in driver'
>
> include/linux/compat.h | 2 ++
> 1 file changed, 2 insertions(+)

applied to u-boot-atmel/master, thanks!

Best regards,
Andreas Bießmann