feat(mediatek) : add/remove build configs

add mt8195 build config and remove mt6795 build config as this platform
is deprecated now

Signed-off-by: Manish Pandey <manish.pandey2@arm.com>
Change-Id: Ie05e79773beeb4b6efd1fe32b906da635ba34d9c
diff --git a/tf_config/mt8195-default b/tf_config/mt8195-default
new file mode 100644
index 0000000..5958ed7
--- /dev/null
+++ b/tf_config/mt8195-default
@@ -0,0 +1,3 @@
+COREBOOT=1
+CROSS_COMPILE=aarch64-none-elf-
+PLAT=mt8195