[msan][NFCI] Remove redundant tests from aarch64-bf16-dotprod-intrinsics.ll (#178832)
https://github.com/llvm/llvm-project/pull/178510#discussion_r2739401507
requested simplifying test cases by using parameters directly for the
intrinsic calls. Doing that reduces the test case to duplicates of
existing tests, thus this patch deletes the redundant tests.