Align Theme, Theme.Holo, and Theme.Holo.Light with Material attrs

Due to themes always overlaying, legacy and Holo themes must explicitly
define Material attributes as @null (e.g. unset).

Deprecates Holo themes. Nobody should be using these anymore.

Bug: 72203192
Test: CtsThemeHostTests & manual verification of bug
Change-Id: I65e9ceddc7aec54b1b8df0231f0755cbd5529886
4 files changed