arm64: dts: ti: k3-am64-main: Enable DMA support

Add the nodes for DMSS INTA, BCDMA and PKTDMA to enable the use of the
DMAs in the system.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Dave Gerlach <d-gerlach@ti.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
Tested-by: Kishon Vijay Abraham I <kishon@ti.com>
Reviewed-by: Grygorii Strashko <grygorii.strashko@ti.com>
Reviewed-by: Vignesh Raghavendra <vigneshr@ti.com>
Link: https://lore.kernel.org/r/20210226144257.5470-5-d-gerlach@ti.com