[Autofill Auth] Toggle should appear only for Android P+

Since only Android versions P and above are supported, settings page
toggle should not be visible if O or lower.

Bug: 949269
Change-Id: Idefda09cd2210843578abc58ae4a11b79b711eac
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2338726Reviewed-by: Tommy Martino <tmartino@chromium.org>
Commit-Queue: Manas Verma <manasverma@google.com>
Cr-Commit-Position: refs/heads/master@{#795676}

chrome/android/java/src/org/chromium/chrome/browser/autofill/settings/AutofillPaymentMethodsFragment.java

@@ -177,6 +177,11 @@ public class AutofillPaymentMethodsFragment extends PreferenceFragmentCompat
     }
 
     private boolean isBiometricAvailable() {
+        // Only Android versions 9 and above are supported.
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.P) {
+            return false;
+        }
+
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
             BiometricManager biometricManager =
                     getStyledContext().getSystemService(BiometricManager.class);