[U-Boot] common: Move dram_init() declaration to common location

[Tom Rini]

On Fri, Jan 30, 2015 at 10:58:44AM +0100, Michal Simek wrote:

> Signed-off-by: Michal Simek <michal.simek at xilinx.com>
> Reviewed-by: Simon Glass <sjg at chromium.org>

Applied to u-boot/master, thanks!

-- 
Tom
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