This fixes a couple problems with the generic target in the latest
2.5.67 kernel.  First is simply a fix for the addition of readX in
the machvec.  The second gets things to link in roughly the same order
when using a generic vs zx1 flavor.  With the current code, sba_init()
is called in the right place when using a zx1 flavor kernel, but
happens way too early on a generic kernel.