Fix fake bold for fallback fonts in frameworks.

This change is analogous to Ic0e9f1bbd8cae9fdd3a6d1d015bb9224c8be545c
in WebView, and depends upon the same Skia change that that CL makes
use of.

This flips the "fake bold" flag on for bold fonts in
TextView.setTypeface(), with the expectation that Skia will ignore
the flag if the final typeface used to render the glyphs is already
bold. It also does the same for StyleSpans, TextAppearanceSpans,
TypefaceSpans, and the Switch widget.

With this, fake bold should work uniformly across all scripts - if
fake bold works for a primary typeface, it should also work for all
fallback typefaces.

Bug: 6629786
Change-Id: Id3b8639ab0df83052ffd82809cb12adaacc1d46b