board_r: remove superfluous #ifdef CONFIG_PRAM

initr_mem() is already enclosed by
	#if defined(CONFIG_PRAM)
	#endif

So there is no need to check CONFIG_PRAM again inside the
function.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>