feat(ast2700): add Aspeed AST2700 platform support

Aspeed AST2700 is a quad-core SoC with ARM Cortex-A35 integrated.
This patch adds the initial platform support for AST2700 and also
updates the documents.

Change-Id: I1796f7aae5ed2d1799e91fabb8949607959cd9b3
Signed-off-by: Chia-Wei Wang <chiawei_wang@aspeedtech.com>
diff --git a/plat/aspeed/ast2700/platform.mk b/plat/aspeed/ast2700/platform.mk
new file mode 100644
index 0000000..16ecf0a
--- /dev/null
+++ b/plat/aspeed/ast2700/platform.mk
@@ -0,0 +1,32 @@
+#
+# Copyright (c) 2023, Aspeed Technology Inc.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+
+include drivers/arm/gic/v3/gicv3.mk
+include lib/xlat_tables_v2/xlat_tables.mk
+
+PLAT_AST2700 := plat/aspeed/ast2700
+
+PLAT_INCLUDES := \
+	-I${PLAT_AST2700}/include
+
+BL31_SOURCES += \
+	common/desc_image_load.c		\
+	lib/cpus/aarch64/cortex_a35.S		\
+	plat/common/plat_gicv3.c		\
+	plat/common/plat_psci_common.c		\
+	drivers/ti/uart/aarch64/16550_console.S	\
+	${PLAT_AST2700}/plat_helpers.S		\
+	${PLAT_AST2700}/plat_topology.c		\
+	${PLAT_AST2700}/plat_bl31_setup.c	\
+	${PLAT_AST2700}/plat_pm.c		\
+	${GICV3_SOURCES}			\
+	${XLAT_TABLES_LIB_SRCS}
+
+PROGRAMMABLE_RESET_ADDRESS := 1
+
+COLD_BOOT_SINGLE_CPU := 1
+
+ENABLE_SVE_FOR_NS := 0