Allow cluster navigation to jump into touchscreenBlocksFocus

Adds an exception to touchscreenBlocksFocus ViewGroups which
are also keyboardNavigationClusters. The behavior we want is
that cluster navigation can jump into touchscreenBlocksFocus
clusters but normal keyboard navigation can't. Once focus is
in a touchscreenBlocksFocus cluster; however, we allow focus
navigation to move freely within that cluster. It remains in
that cluster until a subsequent cluster navigation brings it
back out.

Adds back the touchscreenBlocksFocus attributes to Toolbar
and actionbar so that they behave like they did before.

Bug: 34363323
Test: Added CTS test. Verified desired behavior in a test app

Change-Id: I555bf5570b16a57f0d4c8a020ae509a1e1b33910