[Bug 253574] buffers passed to efi readblocks needs to be block aligned on arm.

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253574

            Bug ID: 253574
           Summary: buffers passed to efi readblocks needs to be block
                    aligned on arm.
           Product: Base System
           Version: 12.2-RELEASE
          Hardware: arm
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: arm
          Assignee: freebsd-arm at FreeBSD.org
          Reporter: bugzilla at ChrisBowman.com

in stand/efi/boot1/ufs_module.c init_dev allocates a buffer and calls dskread
which passes the buffer to the efi entry readblocks from u-booot.
Likewise in stand/efi/libsa/ufsread.c there are calls to dskread.
according to
https://gitlab.denx.de/u-boot/u-boot/-/commit/f59f0825e8b9fdeb8abe43ffd10c5119ca1a032f
as of f59f0825 lib/efi_loader/efi_disk.c checks for block alignment of the
buffer passed to readblocks.

on my armv7 system u-boot insists on 512 byte alignment.

The blocks allocated in init_dev and fsread should be block aligned.

There probably exists a similar problem in zfs_module.c

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