chore: fvp_r:  Initial No-EL3 and MPU Implementation

For v8-R64, especially R82, creating code to run BL1 at EL2, using MPU.

Signed-off-by: Gary Morrison <gary.morrison@arm.com>
Change-Id: I439ac3915b982ad1e61d24365bdd1584b3070425
diff --git a/plat/arm/board/fvp_r/fvp_r_context.S b/plat/arm/board/fvp_r/fvp_r_context.S
new file mode 100644
index 0000000..2746c2e
--- /dev/null
+++ b/plat/arm/board/fvp_r/fvp_r_context.S
@@ -0,0 +1,17 @@
+/*
+ * Copyright (c) 2021, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <asm_macros.S>
+
+	.global	el2_exit
+
+/* ------------------------------------------------------------------
+ * The mechanism, from el3_exit, is not used in this v8-R64 implementation.
+ * ------------------------------------------------------------------
+ */
+func el2_exit
+	exception_return
+endfunc el2_exit