Rename bssl-ffi to bssl-sys

Test: TreeHugger
Change-Id: I7e8e1a73d47e2fbdf81a4d6b51d7d11cea56db35
diff --git a/libs/bssl/src/rand.rs b/libs/bssl/src/rand.rs
index 9343284..e1b3ebe 100644
--- a/libs/bssl/src/rand.rs
+++ b/libs/bssl/src/rand.rs
@@ -16,7 +16,7 @@
 
 use crate::util::check_int_result;
 use bssl_avf_error::{ApiName, Result};
-use bssl_ffi::RAND_bytes;
+use bssl_sys::RAND_bytes;
 
 /// Fills the given `dest` with random data.
 pub fn rand_bytes(dest: &mut [u8]) -> Result<()> {