Update new consent screen for fingerprint

- Move top description into subtitle for landscape mode
- Update the button text

Bug: 177591560
Test: robotest and visual verified
1) Settings -> Security -> Fingerprint
2) Rotate the device and check if the description is on the right side

Change-Id: Ie20597fce48f73aa83c5d637682db1860c384a7a

src/com/android/settings/biometrics/BiometricEnrollBase.java

@@ -173,6 +173,10 @@ public abstract class BiometricEnrollBase extends InstrumentedActivity {
         setHeaderText(resId, false /* force */);
     }
 
+    protected void setDescriptionText(int resId) {
+        getLayout().setDescriptionText(resId);
+    }
+
     protected FooterButton getNextButton() {
         if (mFooterBarMixin != null) {
             return mFooterBarMixin.getPrimaryButton();