[U-Boot] beagleboard: Update comment in get_board_rev()

[Tom Rini]

On Tue, Apr 16, 2013 at 10:32:12AM -0000, Tom Rini wrote:

> We are able to tell the difference between xM Rev Ax/Bx and xM Rev Cx,
> and have been for some time.  The comment above the function however did
> not list this, so update.
> 
> Signed-off-by: Tom Rini <trini at ti.com>

Applied to u-boot-ti/master, thanks!

-- 
Tom
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