Documentation: dt_bindings: update pfeng driver

commit  b6c1851b98bfe175e9dd5dbdc1ecea3c0ee1c23e from
https://source.codeaurora.org/external/autobsps32/linux



Synchronized changes with pfeng driver BETA 0.9.3

Issue: ALB-6478
Signed-off-by: Jan Petrous <jan.petrous@nxp.com>
Signed-off-by: Meng Li <Meng.Li@windriver.com>