build: Added build configs for newly supported platforms in tftf

This commit adds support for tftf build configs
for the following platforms

	* n1sdp
	* corstone1000
	* sgi575
	* tegra186
	* tegra194
	* tegra210

Signed-off-by: Arvind Ram Prakash <arvind.ramprakash@arm.com>
Change-Id: I90d0dc996838557bc8603e7a1b2bbad32c7de004
diff --git a/tftf_config/tegra210-default b/tftf_config/tegra210-default
new file mode 100644
index 0000000..8e468a7
--- /dev/null
+++ b/tftf_config/tegra210-default
@@ -0,0 +1,2 @@
+CROSS_COMPILE=aarch64-none-elf-
+PLAT=tegra210