drivers: dma_mcux_edma: improve interrupt handling

The current implementation iterates over all channels
even if only several channels share the same irq. This
introduces one more dt property to describe an offset
between two channels share the same interrupt id.

Beside that, the error interrupt must be put as last
element of "interrupt" dt property.

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