m3: move WearMaterial3 to Material3 to be more generic

- rename: WearMaterial3 with Material3
- move Materail3 styles out of device_defaults. Note that we only split
  concept of device default and Materail3 but we still use device
  default as a condition for Wear Material3.

Flag: EXEMPT. renmaing
Test: maunal
Bug: 383898608
Change-Id: I2a4549dff913d0d2ca82dec75192ff959f9e95a6