ARM: configs: at91: sama7: add MCHP PDMC and DMIC drivers

Enable drivers needed for Microchip's PDMC and PDM microphones.

Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Link: https://lore.kernel.org/r/20220307122202.2251639-7-codrin.ciubotariu@microchip.com