FreeBSD_HEAD_i386 - Build #3873 - Fixed

FreeBSD_HEAD_i386 - Build #3873 - Fixed:

Build information: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_i386/3873/
Full change log: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_i386/3873/changes
Full build log: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_i386/3873/console

Change summaries:

305520 by jhibbits:
Disable the qoriq errata fix for now

It hangs more often than it actually works it seems.  Further debugging is
needed to determine why, but for now the system needs to be able to boot.

305517 by jhibbits:
Allow pmap_early_io_unmap() to reclaim memory

pmap_early_io_map()/pmap_early_io_unmap(), if used in pairs, should be used in
the form:

pmap_early_io_map()
..do stuff..
pmap_early_io_unmap()

Without other allocations in the middle.  Without reclaiming memory this can
leave large holes in the device space.

While here, make a simple change to the unmap loop which now permits it to unmap
multiple TLB entries in the range.