refactor(rpi): move more platform-specific code into common

In preparation for RPi 5 support, which will reuse most of the RPi 4
logic except for DTB patching.

Change-Id: I6f6ef96933711a1798757a3389adae1b8ee3de6c
Signed-off-by: Mario Bălănică <mariobalanica02@gmail.com>
diff --git a/plat/rpi/common/include/plat_macros.S b/plat/rpi/common/include/plat_macros.S
new file mode 100644
index 0000000..576d0ff
--- /dev/null
+++ b/plat/rpi/common/include/plat_macros.S
@@ -0,0 +1,20 @@
+/*
+ * Copyright (c) 2016-2024, Arm Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+#ifndef PLAT_MACROS_S
+#define PLAT_MACROS_S
+
+	/* ---------------------------------------------
+	 * The below required platform porting macro
+	 * prints out relevant platform registers
+	 * whenever an unhandled exception is taken in
+	 * BL31.
+	 * Clobbers: x0 - x10, x16, x17, sp
+	 * ---------------------------------------------
+	 */
+	.macro plat_crash_print_regs
+	.endm
+
+#endif /* PLAT_MACROS_S */