drivers: dma: iProc PAX: Fix use of deprecated APIs

Drivers are using DEVICE_AND_API_INIT which is deprecated so convert
the iproc_pax dma drivers over to using DEVICE_DT_INST_DEFINE and
DEVICE_DT_INST_GET.

Fixes #32153

Signed-off-by: Kumar Gala <kumar.gala@linaro.org>