da850-evm: add UI Expander pushbuttons

This patch adds EV_KEYs for each of the 8 pushbuttons on the UI board via a
gpio-key device.

The expander is a tca6416; it controls the SEL_{A,B,C} lines which enable and
disable the peripherals found on the UI board in addition to the 8 pushbuttons
mentioned above. The reason the existing tca6416-keypad driver is not employed
is because there was no aparent way to keep the gpio lines used as
SEL_{A,B,C} registered while simultaneously registering the pushbuttons as a
tca6416-keypad instance.

Some experimentation with the polling interval was performed; we were searching
for the largest polling interval that did not affect the feel of the
responsiveness of the buttons. It is very subjective but 200ms seems to be a
good value that accepts firm pushes but rejects very light ones. The key values
assigned to the buttons were arbitrarily chosen to be F1-F8.

Signed-off-by: Ben Gardiner <[email protected]>
Reviewed-by: Chris Cordahi <[email protected]>
CC: Govindarajan, Sriramakrishnan <[email protected]>
Reviewed-by: Sekhar Nori <[email protected]>
Signed-off-by: Sekhar Nori <[email protected]>
CC: Kevin Hilman <[email protected]>
CC: Gabor Juhos <[email protected]>
Signed-off-by: Kevin Hilman <[email protected]>

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