Kernel: Move common aarch64 asm functions into kernel folder and NS

Author: https://github.com/jamesmintram
Commit: c2d7e200eb
Pull-request: https://github.com/SerenityOS/serenity/pull/10514
Reviewed-by: https://github.com/mundak ✅
Reviewed-by: https://github.com/nico

Kernel/Prekernel/Arch/aarch64/PrekernelExceptions.cpp

@@ -4,6 +4,7 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
+#include <Kernel/Arch/aarch64/Aarch64Asm.h>
 #include <Kernel/Arch/aarch64/Aarch64Registers.h>
 #include <Kernel/Prekernel/Arch/aarch64/Aarch64_asm_utils.h>
 #include <Kernel/Prekernel/Arch/aarch64/Prekernel.h>
@@ -81,7 +82,7 @@ static void set_up_el1()
 
 void drop_to_exception_level_1()
 {
-    switch (get_current_exception_level()) {
+    switch (Kernel::get_current_exception_level()) {
     case ExceptionLevel::EL3:
         drop_to_el2();
         [[fallthrough]];