Controls API - Remove unnecessary templates

DiscreteToggleTemplate and CoordinatedRangeTemplate are no longer
necessary. DiscreteToggletemplate is being replaced by
StatelessTemplate, and there is no need for the latter.

Bug: 149476062
Test: atest ControlTemplateTest
Change-Id: I2cdd3d26c0b306876a47783ead257754966a339c
5 files changed