[test][AArch64][CodeGen] Delete redundant check lines (#87965)

llvm/test/CodeGen/AArch64/elf-globals-pic.ll:

Since https://reviews.llvm.org/D91734, elf-globals-static.ll test
contains several `CHECK-PIC` lines. They do not seem to bring any value
since there are no FileCheck run lines checking against this prefix. The
right place for such tests should be elf-globals-pic.ll, which already
contains check lines being deleted in this commit. Both
elf-globals-pic.ll and elf-globals-static.ll were created after
splitting arm64-elf-globals.ll in 6dbd0eac, and having `CHECK-PIC` lines
in elf-globals-static.ll seems like an issue occurred because of git
thinking that elf-globals-pic.ll is a new file and elf-global-static.ll
is a rename of arm64-elf-globals.ll.

llvm/test/CodeGen/AArch64/tagged-globals-pic.ll:

Similar to elf-globals-pic.ll, contains unneeded
`CHECK-SELECTIONDAGISEL` and `CHECK-GLOBALISEL` directives not checked
by any FileCheck invocation. These directives are present in
tagged-globals-static.ll. Both tests are present in the code tree since
fd326398 when tagged-globals.ll was splitted into
tagged-globals-{pic|static}.ll.