misc: microchip: pci1xxxx: Add functions to configure gpio pins as input / output, get status, handle I/O for gpio pins.

direction_input and direction_output functions configures a gpio pin as
input and output respectively. get_direction function returns if a gpio
pin is output or input. get function returns the value of a gpio pin
whereas set function assigns output value for a gpio pin.
Signed-off-by: Kumaravel Thiagarajan <kumaravel.thiagarajan@microchip.com>
Link: https://lore.kernel.org/r/20220824200047.150308-4-kumaravel.thiagarajan@microchip.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>