Initial import.

Bug: 284386483
Test: atest smccc_test_src_lib
Change-Id: I3ac6d3d27cf396864dc00c845b135f447e6933a2
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
new file mode 100644
index 0000000..3bd233d
--- /dev/null
+++ b/rust-toolchain.toml
@@ -0,0 +1,2 @@
+[toolchain]
+targets = ["aarch64-unknown-none"]