[AArch64] Fix spelling of ICH_ELRSR_EL2 system register

This register was mis-spelled as ICH_ELSR_EL2, but has the correct encoding for
ICH_ELRSR_EL2.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@324325 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed