Merge changes from topic "tegra194-spmd" into integration

* changes:
  Tegra194: introduce support for `SPD=spmd`
  Tegra: introduce backend support to compile libfdt
  Tegra: disable signed comparison
  plat: common: include "bl_common.h" from plat_spmd_manifest.c

plat/common/plat_spmd_manifest.c

@@ -9,6 +9,7 @@
 #include <string.h>
 #include <libfdt.h>
 
+#include <common/bl_common.h>
 #include <common/debug.h>
 #include <common/fdt_wrappers.h>
 #include <lib/xlat_tables/xlat_tables_v2.h>

plat/nvidia/tegra/platform.mk

@@ -55,27 +55,30 @@ ENABLE_STACK_PROTECTOR		:=	strong
 # Enable SDEI
 SDEI_SUPPORT			:= 1
 
+# modify BUILD_PLAT to point to SoC specific build directory
+BUILD_PLAT	:=	${BUILD_BASE}/${PLAT}/${TARGET_SOC}/${BUILD_TYPE}
+
 include plat/nvidia/tegra/common/tegra_common.mk
 include ${SOC_DIR}/platform_${TARGET_SOC}.mk
 
 $(eval $(call add_define,ENABLE_TEGRA_WDT_LEGACY_FIQ_HANDLING))
 $(eval $(call add_define,RELOCATE_BL32_IMAGE))
 
-# modify BUILD_PLAT to point to SoC specific build directory
-BUILD_PLAT	:=	$(abspath ${BUILD_BASE})/${PLAT}/${TARGET_SOC}/${BUILD_TYPE}
-
 # platform cflags (enable signed comparisons, disable stdlib)
-TF_CFLAGS	+= -Wsign-compare -nostdlib
+TF_CFLAGS	+= -nostdlib
 
 # override with necessary libc files for the Tegra platform
 override LIBC_SRCS :=	$(addprefix lib/libc/,		\
 			aarch64/setjmp.S		\
 			assert.c			\
+			memchr.c			\
+			memcmp.c			\
 			memcpy.c			\
 			memmove.c			\
 			memset.c			\
 			printf.c			\
 			putchar.c			\
+			strrchr.c			\
 			strlen.c			\
 			snprintf.c)
 

plat/nvidia/tegra/soc/t194/platform_t194.mk

@@ -70,3 +70,13 @@ BL31_SOURCES		+=	lib/extensions/ras/std_err_record.c		\
 				lib/extensions/ras/ras_common.c			\
 				${SOC_DIR}/plat_ras.c
 endif
+
+# SPM dispatcher
+ifeq (${SPD},spmd)
+# include device tree helper library
+include lib/libfdt/libfdt.mk
+# sources to support spmd
+BL31_SOURCES		+=	plat/common/plat_spmd_manifest.c	\
+				common/fdt_wrappers.c			\
+				${LIBFDT_SRCS}
+endif