[AArch64] Change the filename of the Exynos M1 scheduling defs

After request by Matthias Braun in https://reviews.llvm.org/D42387.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@323686 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed