[libc] Remove unused aarch64 sqrt and sqrtf implementations

[mcgrathr]

Summary

These files are not used because the generic sqrt and sqrtf
functions already go through internal layers that reach the
machine-specific internal implemenations.

[sivachandra]

Looks like this change removed the targets but did not remove the files: https://github.com/llvm/llvm-project/commit/21c4c82c2026bac1f53be54923c0663d41d0a0aa

libc/src/math/aarch64/sqrt.cpp

-//===-- Implementation of the sqrt function for aarch64 -------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-#include "src/math/sqrt.h"
-#include "src/__support/common.h"
-
-namespace __llvm_libc {
-
-LLVM_LIBC_FUNCTION(double, sqrt, (double x)) {
-  double y;
-  __asm__ __volatile__("fsqrt %d0, %d1\n\t" : "=w"(y) : "w"(x));
-  return y;
-}
-
-} // namespace __llvm_libc

libc/src/math/aarch64/sqrtf.cpp

-//===-- Implementation of the sqrtf function for aarch64 ------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-#include "src/math/sqrtf.h"
-#include "src/__support/common.h"
-
-namespace __llvm_libc {
-
-LLVM_LIBC_FUNCTION(float, sqrtf, (float x)) {
-  float y;
-  __asm__ __volatile__("fsqrt %s0, %s1\n\t" : "=w"(y) : "w"(x));
-  return y;
-}
-
-} // namespace __llvm_libc