[AArch64][GlobalISel] Replace test REQUIRES with lit.local.cfg. NFC.

I forgot the REQUIRES once (see r277486).
Let's prevent it from happening again.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@277499 91177308-0d34-0410-b5e6-96231b3b80d8
10 files changed