android: reduce visibility of new_with_fake_root.

The `new_with_fake_root` constructor is only used by crate internal test
code. This commit changes the visbility to be crate-internal, matching
the other `Verifier`s.

Author: cpu

src/verification/android.rs

@@ -63,7 +63,7 @@ impl Verifier {
     }
 
     #[cfg(any(test, feature = "ffi-testing"))]
-    pub fn new_with_fake_root(root: &[u8]) -> Self {
+    pub(crate) fn new_with_fake_root(root: &[u8]) -> Self {
         Self {
             test_only_root_ca_override: Some(root.into()),
         }