boards: arm: Enable dma driver on mimxrt1064_evk

Enables the dma driver on the mimxrt1064_evk board. The board
documentation is not updated because it already mentions dma driver
support.

Tested with:
  - tests/drivers/dma/chan_blen_transfer
  - tests/drivers/dma/chan_link_transfer
  - tests/drivers/dma/loop_transfer

Signed-off-by: Maureen Helm <maureen.helm@nxp.com>