Restricted Context layout font loading in TextView

When the context is restricted, avoid loading custom fonts in
layouts. This is currently only done by TextView. Loading
system fonts via their string name is still OK, just not by
resource id.

Test: cts attached in topic
Bug: 35763094, 31218679
Change-Id: I0dc3a3eade0439c503c58a582b083d7ba1dd4aa3