Fix Fingerprint enrollment UI when display size is largest.

1. Remove land/udfps_enroll_enrolling and use the default land layout
instead. Swap header and content when necessary to avoid overlap.
2. Add UdfpsEnrollEnrollingView.java

Test: manual test - 1. Set system display and font size largest
	            2. Launch fingerprint enrollment and check UI.
Test: atest FingerprintEnrollEnrollingTest
Bug: 269060514
Bug: 283169056
Change-Id: Ifbe6c92c4213979952f2f89a1cd595c9c4bff6ec