Make HomeStatusBarComponent a Subcomponent of SystemUIDisplaySubcomponent

Since some SystemUI variants don't have a status bar, we create
SystemUIPhoneDisplaySubcomponent, which includes the
HomeStatusBarComponent as a Subcomponent, while the standard one doesn't.

Now, SystemUIPhoneDisplaySubcomponent is included in
ReferenceSystemUIModule, which allow other variants to include the
standard one, that doesn't include the HomeStatusBarComponent.

Test: Build all SystemUI variants
Bug: 417927751
Flag: EXEMPT Dagger change that can't be flagged
Change-Id: I22fe2e54d663eae0c5622fd7f2c7f2506f4b087d