Device Default theming updates for Wear

- aligning styled attributes with those defined in O RC
- reduce coupling to/mutation of the material theme
- includes all previously customized values (i.e. WTS neutral)

Test: should be no visible difference (changes are focused
      on simplifying resources and their inheritance via theme
      definitions, as well as explicitly defining additional
      resources not currently used in the application layer).

WTS OemColorsTest should pass:
run wts --module WtsOemConfigDeviceTestCases
(no failure on colors... doesn't mean no failures)

Bug:b/63525308

Change-Id: I5c3c3b848e0090169b884ec005113aeac2560993