stand/efi: Allow RELAXED or STRICT boot policies

The RELAXED boot policy will automatically search for any root
filesystem (currently zfs only) on any device. STRICT policy only
searches on the boot

stand/efi: Allow RELAXED or STRICT boot policies

The RELAXED boot policy will automatically search for any root
filesystem (currently zfs only) on any device. STRICT policy only
searches on the boot device. RELEAXED will still prefer the device we
booted from, which is the smallest behavior change we should do. STRICT
may be needed for releases, though.

Sponsored by: Netflix
Reviewed by: glebius
Differential Revision: https://reviews.freebsd.org/D55107

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loader.efi: try all ZFS pools found by efi_zfs_probe()

Remove global uint64_t pool_guid and instead iterate over all pools that
efizfs_get_zfsinfo_list() provides.

The global pool_guid used to mark

loader.efi: try all ZFS pools found by efi_zfs_probe()

Remove global uint64_t pool_guid and instead iterate over all pools that
efizfs_get_zfsinfo_list() provides.

The global pool_guid used to mark that we have constructed a ZFS pool and
the pool label that was used for that was stored on a partition that is
the EFI image device handle.

First problem here is that it is too restrictive. If the very first
device to probe is a spare member of a pool, it will be used to
instantiate a pool but (pd->pd_handle == boot_img->DeviceHandle) won't be
true, thus global pool_guid won't be populated and ZFS boot won't be
tried.

Second problem is that potentially we may find several pools, and all
should be tried to boot. Note that the code for that is already here -
efizfs_get_zfsinfo_list() is imported by efizfs.h but was not used until
now.

Reviewed by: imp
Differential Revision: https://reviews.freebsd.org/D55094

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