boards: arc: hsdk: Enable CY8C95XX if GPIO

The board has an I2C GPIO expander on it.  A number of samples utilize
LEDs on GPIOs for testing purpose so it makes sense to enable the GPIO
expander (CONFIG_GPIO_CY8C95XX) driver when CONFIG_GPIO has been
enabled.  We have to also enable I2C since the expander is connected
over an I2C interface.

Signed-off-by: Kumar Gala <kumar.gala@linaro.org>