feat(cpus): add a64fx cpu to tf-a

while sbsa maintainers upstream decide whether new cpus types
should be in, add fujitsu a64fx cpu type in advance

Signed-off-by: Itaru Kitayama <itaru.kitayama@fujitsu.com>
Change-Id: I521a62f1233f3fe6e92f040edaff2cc60a1bd874
diff --git a/include/lib/cpus/aarch64/a64fx.h b/include/lib/cpus/aarch64/a64fx.h
new file mode 100644
index 0000000..b7342b0
--- /dev/null
+++ b/include/lib/cpus/aarch64/a64fx.h
@@ -0,0 +1,15 @@
+/*
+ * Copyright (c) 2022, Fujitsu Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef A64FX_H
+#define A64FX_H
+
+#include <lib/utils_def.h>
+
+/* A64FX midr for revision 0 */
+#define A64FX_MIDR					U(0x461f0010)
+
+#endif /* A64FX_H */