boards: microchip: pic32cx_sg61_cult: add DMA to supported list

Update pic32cx_sg61_cult.yml to include DMA in the supported
features list.
Also enable the DMA controller node in pic32cx_sg61_cult.dts.

Signed-off-by: Arunprasath P <arunprasath.p@microchip.com>
2 files changed