[UPDATED v3] WM97xx touchscreen drivers

[Mark Brown]

This patch series adds support for the touchscreen controllers provided
by Wolfson Microelectronics WM97xx series chips in both polled and
streaming modes.

Changes since last submission:

 - Replace custom wm97xx bus type with use of the platform bus.
 - Remove reference counting on device open duplicated from input core.
 - Minor style and correctness cleanups.
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