AutoSize TextView (part 6) - introduce autoSizeMaxTextSize

Using textSize as maxTextSize for autosizing is buggy and
unclean. Introduce and use new autoSizeMaxTextSize attribute for
TextView.

Also while doing this optimized the auto-size process by removing
unnecessary computations:

1. If auto-size is enabled than setTextSize(...) is no-op.
2. After setting the text size internally and from the auto-size
context onMeasure() will stop doing another round of redundant
measurements..

Bug: 33449596
Bug: 32221168
Test: atttached in the same topic
Change-Id: Ieecaea6df0aebb4c182bdd1114e3c6fc5066bed1