boards: mr_canhubk3: configuring DMA for LPUART

Assign DMA channels/sources for all LPUARTs exist on the
board so that async APIs can be used for all instances
when enabled.

Because LPUART 1 & 9, LPUART 2 & 10 share the same DMA
sources for TX and RX, be aware when using async APIs
for those instances.

Signed-off-by: Dat Nguyen Duy <dat.nguyenduy@nxp.com>