FreeBSD: Kernel module should depend on xdr not krpc after 1300092

[ghost]

Motivation and Context

Closes #10442

Since https://reviews.freebsd.org/D24408 FreeBSD provides XDR functions
in the xdr module instead of krpc.

Description

For FreeBSD 13, the MODULE_DEPEND should be changed to xdr

How Has This Been Tested?

Built and loaded correctly on recent 13-current.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Performance enhancement (non-breaking change which improves efficiency)
• Code cleanup (non-breaking change which makes code smaller or more readable)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (a change to man pages or other documentation)

Checklist:

• My code follows the ZFS on Linux code style requirements.
• I have updated the documentation accordingly.
• I have read the contributing document.
• I have added tests to cover my changes.
• I have run the ZFS Test Suite with this change applied.
• All commit messages are properly formatted and contain Signed-off-by.

[ghost]

Well that's not good 🤔

[ghost]

Manually confirmed this works on head for now.

[codecov]

Codecov Report

Merging #10443 into master will decrease coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #10443      +/-   ##
==========================================
- Coverage   79.58%   79.51%   -0.07%     
==========================================
  Files         391      391              
  Lines      123872   123872              
==========================================
- Hits        98586    98503      -83     
- Misses      25286    25369      +83     

Flag	Coverage Δ
#kernel	79.97% <ø> (-0.06%)	⬇️
#user	65.75% <ø> (-0.37%)	⬇️

Impacted Files	Coverage Δ
module/os/linux/spl/spl-kmem-cache.c	75.58% <0.00%> (-8.50%)	⬇️
module/zfs/vdev_indirect.c	73.66% <0.00%> (-7.00%)	⬇️
module/zfs/bpobj.c	86.86% <0.00%> (-4.29%)	⬇️
module/os/linux/zfs/zio_crypt.c	79.97% <0.00%> (-1.23%)	⬇️
module/zfs/vdev_removal.c	96.45% <0.00%> (-1.03%)	⬇️
cmd/ztest/ztest.c	79.11% <0.00%> (-1.03%)	⬇️
module/zfs/vdev_initialize.c	96.83% <0.00%> (-0.95%)	⬇️
cmd/zed/agents/zfs_mod.c	77.55% <0.00%> (-0.67%)	⬇️
module/zfs/arc.c	89.08% <0.00%> (-0.63%)	⬇️
module/zfs/vdev.c	89.95% <0.00%> (-0.61%)	⬇️
... and 45 more

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