Searchview layout cleanup. Some more tweaks required for Market.

Bug: 3321263

Submit area should be visible when the field has focus, irrespective of text content.
Make sure that the fields get highlighted when focused.
Also fix an issue with hint not being applied from the SearchableInfo.
Bug: 3470348

Change-Id: If399d9551f89312c19485e249043f5823a862499