dts: bindings: correct information in mcux edma bindings

With the current implementation, the 1st cell is not DMAMUX id
as mentioned in the bindings (0 for DMAMUX0 and 1 for DMAMUX1).

Moreover, the referenced Linux bindings is obsoleted, it was
migrated to use yaml syntax

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