android: clarify the construction of the display components. remove 4 functions from the "DisplayResourceFactory" interface that wrapped the constructors of some classes for no real purpose. Rename "DisplayBufferBuilder" to "DisplayComponentFactory" and clarify the functions in the interface. This mostly gets the system better suited to build additional DisplayBuffers and framebuffers for the external display.
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Approved by PS Jenkins bot, Alan Griffiths, Robert Carr.