[U-Boot] serial: Use ARRAY_SIZE instead of reinventing it

[Tom Rini]

On Sun, Jun 23, 2013 at 12:46:41AM +0800, Axel Lin wrote:

> Signed-off-by: Axel Lin <axel.lin at ingics.com>
> 
> ---
> drivers/serial/serial.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)

Applied to u-boot/master, thanks!

-- 
Tom
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