While x86 is the only user and this could in principle be moved to
arch_cpu_init() there is some justification for this being a separate
call. It provides a way to handle init which is not CPU-specific, but
must happen before the CPU can be set up.

Rename the function to be more generic.
Signed-off-by: NSimon Glass <sjg@chromium.org>
Reviewed-by: NStefan Roese <sr@denx.de>