Kernel: Add StdLib.cpp and UserOrKernelBuffer.cpp to aarch64 build

Also remove UserOrKernelBuffer::{read, write} and __stack_chk_fail from
Dummy.cpp and init.cpp respectively.

Kernel/CMakeLists.txt

@@ -485,7 +485,9 @@ else()
         KString.cpp
         KSyms.cpp
         MiniStdLib.cpp
+        StdLib.cpp
         UBSanitizer.cpp
+        UserOrKernelBuffer.cpp
 
         Devices/DeviceManagement.cpp