[LLD][ELF][AArch64] Update test with incorrect REQUIRES line [NFC]

D54759 introduced aarch64-combined-dynrel.s and
aarch64-combined-dynrel-ifunc.s . Unfortunately the requires line
at the top was AArch64 instead of aarch64 which means they were never
run. Update the tests to use aarch64 and fix to match current lld output.

Differential Revision: https://reviews.llvm.org/D117896