dt-bindings: dma: fix compatible in example for mpfs-fpga-dma

commit 731b45e65b88dca26506301bf140ca26a71adeb5 from
https://github.com/linux4microchip/linux.git

 linux-6.6-mchp+fpga

Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: harish h <harish.h@windriver.com>