Rename bssl-ffi to bssl-sys

Test: TreeHugger
Change-Id: I7e8e1a73d47e2fbdf81a4d6b51d7d11cea56db35
diff --git a/rialto/src/main.rs b/rialto/src/main.rs
index 1215021..e705562 100644
--- a/rialto/src/main.rs
+++ b/rialto/src/main.rs
@@ -28,7 +28,7 @@
 use crate::error::{Error, Result};
 use crate::fdt::read_dice_range_from;
 use alloc::boxed::Box;
-use bssl_ffi::CRYPTO_library_init;
+use bssl_sys::CRYPTO_library_init;
 use ciborium_io::Write;
 use core::num::NonZeroUsize;
 use core::slice;