Update udeb package definitions

Ben Hutchingsrequested to merge
benh/linux:udeb-updates into debian/latest

Enable and disable udeb packages on various architectures where it seems they are or aren't useful:

  • [mips*,sh4] udeb: Remove minix-modules package, since these machines can't run MINIX
  • [mips*] udeb: Remove affs-modules package, since these machines can't run AmigaOS
  • udeb: Build {jfs,loop,ppp,squashfs,uinput,xfs}-modules everywhere we can (Closes: #1132155)

Depends on !1870 (merged)

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