[U-Boot] common: remove unused prototypes

[Tom Rini]

On Mon, Mar 12, 2018 at 09:19:22AM +0100, Patrick Delaunay wrote:

> Remove the prototypes for 4 functions no more existing
> in U-Boot code (checked by grep):
> - checkflash
> - checkdram
> - mdm_init
> - setup_board_extra
> 
> Signed-off-by: Patrick Delaunay <patrick.delaunay at st.com>

Applied to u-boot/master, thanks!

-- 
Tom
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