misc: microchip: pci1xxxx: Add power management functions - suspend & resume handlers.

Power event handlers suspend and resume are invoked by the operating
system to notify the driver about the power events. Wakeup is enabled
before entering suspend and disabled after resuming.

Signed-off-by: Kumaravel Thiagarajan <kumaravel.thiagarajan@microchip.com>
Link: https://lore.kernel.org/r/20220824200047.150308-6-kumaravel.thiagarajan@microchip.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>