Create specs for hotseat

Some attributes of hotseat change depending on the size of the device. In the future more attributes could be moved to the spec, e.g. hotseat icons.

Fix: 292204436
Test: CalculatedHotseatSpecTest
Test: HotseatSpecsTest
Test: SizeSpecTest
Test: DeviceProfileResponsiveDumpTest
Test: DeviceProfileResponsiveAlternativeDisplaysDumpTest
Flag: ENABLE_RESPONSIVE_WORKSPACE
Change-Id: I6a4e05d75af819dbf1444a5ca45c2080f55dc203