[U-Boot] [PATCH V3] AT91: Small fix on AT91 USART initialization code

[Reinhard Meyer]

Dear Hong Xu,
> Before reset dbgu transmitter, we just wait TXEMPTY to drain the
> transmitter register(Just in case). If not doing this, we may sometimes
> see several weird characters from DBGU.
> 
> A short delay is also added to make sure the new serial settings are
> settled.
> 
> Signed-off-by: Hong Xu <hong.xu at atmel.com>
> ---
> Changes since V2,
>   Using __udelay to avoid potential endless loop
> 
>  drivers/serial/atmel_usart.c |   11 ++++++++++-
>  1 files changed, 10 insertions(+), 1 deletions(-)
Applied to u-boot-atmel/next.
Thanks,
Reinhard