Update toolchain files

Add aarch64-none-linux-gnu toolchain file

Change-Id: I04742a8e0478f31087ea9c0d5a7d62c7e07bf4f4
diff --git a/cmake/toolchain/aarch64-linux-gnu.cmake b/cmake/toolchain/aarch64-linux-gnu.cmake
index 31fd953..8d95e57 100644
--- a/cmake/toolchain/aarch64-linux-gnu.cmake
+++ b/cmake/toolchain/aarch64-linux-gnu.cmake
@@ -1,5 +1,5 @@
 #
-# SPDX-FileCopyrightText: Copyright 2020-2022 Arm Limited and/or its affiliates <open-source-office@arm.com>
+# SPDX-FileCopyrightText: Copyright 2020-2023 Arm Limited and/or its affiliates <open-source-office@arm.com>
 #
 # SPDX-License-Identifier: Apache-2.0
 #
@@ -16,9 +16,11 @@
 # limitations under the License.
 #
 
-set(CMAKE_SYSTEM_NAME Generic)
+set(CMAKE_SYSTEM_NAME Linux)
 set(CMAKE_C_COMPILER "aarch64-linux-gnu-gcc")
 set(CMAKE_CXX_COMPILER "aarch64-linux-gnu-g++")
+set(CMAKE_LINKER "aarch64-linux-gnu-ld")
+
 set(CMAKE_CXX_STANDARD 14)
 set(CMAKE_SYSTEM_PROCESSOR "aarch64")