add build config for newly added platforms

adding build config for following platforms
 - Marvell: t9130
 - Mediatek: mt8192
 - Qualcomm: sc7180

Change-Id: Iedd0f08c155e46b9193115e71c72854587c0db89
Signed-off-by: Manish Pandey <manish.pandey2@arm.com>
diff --git a/tf_config/sc7180-default b/tf_config/sc7180-default
new file mode 100644
index 0000000..2f8b19c
--- /dev/null
+++ b/tf_config/sc7180-default
@@ -0,0 +1,3 @@
+COREBOOT=1
+CROSS_COMPILE=aarch64-none-elf-
+PLAT=sc7180