Revert "[ARM] Fix assembly and disassembly for VMRS/VMSR"

This reverts r310243. Only MVFR2 is actually restricted to v8 and it'll be a
little while before we can get a proper fix together. Better that we allow
incorrect code than reject correct in the meantime.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@310384 91177308-0d34-0410-b5e6-96231b3b80d8
9 files changed