Move input definitions into separate HAL

The types added for input in InputClassifier HAL are not specific to
that HAL. These are common input definitions.

To allow for future reuse in this and other HALs, move these definitions
into a separate, type-only HAL android::hardware::input::common.

This will be similar to such existing HALs as:
hardware/interfaces/graphics/common
hardware/interfaces/camera/common
hardware/interfaces/audio/common

Test: make only
Bug: 111480215
Change-Id: I16d76d6bdb48b24487b232fda45c6146e1003fe9