cpu: add support for Demeter CPU

This patch adds the basic CPU library code to support the Demeter
CPU.  This CPU is based on the Makalu-ELP core so that CPU lib code
was adapted to create this patch.

Signed-off-by: John Powell <john.powell@arm.com>
Change-Id: Ib5740b748008a72788c557f0654d8d5e9ec0bb7f
diff --git a/include/lib/cpus/aarch64/cortex_demeter.h b/include/lib/cpus/aarch64/cortex_demeter.h
new file mode 100644
index 0000000..9dd0987
--- /dev/null
+++ b/include/lib/cpus/aarch64/cortex_demeter.h
@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2021, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef CORTEX_DEMETER_H
+#define CORTEX_DEMETER_H
+
+#define CORTEX_DEMETER_MIDR				U(0x410FD4F0)
+
+/*******************************************************************************
+ * CPU Extended Control register specific definitions
+ ******************************************************************************/
+#define CORTEX_DEMETER_CPUECTLR_EL1			S3_0_C15_C1_4
+
+/*******************************************************************************
+ * CPU Power Control register specific definitions
+ ******************************************************************************/
+#define CORTEX_DEMETER_CPUPWRCTLR_EL1			S3_0_C15_C2_7
+#define CORTEX_DEMETER_CPUPWRCTLR_EL1_CORE_PWRDN_BIT	U(1)
+
+#endif /* CORTEX_DEMETER_H */