Input: omap-keypad - drop optional GPIO support

The driver supports passing some GPIO lines for rows and columns
through the driver data, but there is no in-kernel user of this.

Further the use seems convoluted because the GPIO lines are unused
in the driver, then explicitly free:ed when removing it without
being requested when probing it, which is assymetric and just
a recepie for disaster.

Remove the support for these unused GPIOs, if need be support can
be reestablished in an organized fashion using GPIO descriptors.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Tony Lindgren <tony@atomide.com>
Link: https://lore.kernel.org/r/20231129-descriptors-input-v1-3-9433162914a3@linaro.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

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