Much of the local bf533-stamp.h header is unused, and the few bits that
are are only needed in one file.  So move the few used bits out and punt
all the rest.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

Give the CF/IDE code its own file to keep things cleanly separated.  While
we're here, clean up the code to use common functions.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>