FreeBSD_HEAD_arm64 - Build #3048 - Fixed

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FreeBSD_HEAD_arm64 - Build #3048 - Fixed:

Build information: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_arm64/3048/
Full change log: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_arm64/3048/changes
Full build log: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_arm64/3048/console

Change summaries:

298951 by jhb:
Revert bus_get_cpus() for now.

I really thought I had run this through the tinderbox before committing,
but many places need <sys/types.h> -> <sys/param.h> for <sys/bus.h> now.

298950 by jhb:
Fix an off by one error when remapping MSI-X vectors.

pci_remap_msix() can be used to alter the mapping of allocated
MSI-X vectors to the MSI-X table.  The code had an off by one error
when adding the IRQ resources after performing a remap.  This was
fatal for any vectors in the table that used the "last" valid IRQ as
those vectors were assigned a garbage IRQ value.

MFC after:	3 days

298949 by peter:
Change a rounding operation that had missing braces into a roundup2()
macro.  Adjust the buffer clipping code to work as expected.

This prevented a number of machines in the FreeBSD.org cluster from
booting due to "ZFS: i/o error - all block copies unavailable"
after an unclean shutdown.