dts: s32g27a: pfe: update properties for 0.9.3 driver

commit  c020082d59bf496868547a654938fba85e7c31b1 from
https://source.codeaurora.org/external/autobsps32/linux



- Property 'firmware-name' removed as not used anymore.
- Added property 'dma-coherent' to support performance
  on silicon cut 2.0

Issue: ALB-6400
Signed-off-by: Jan Petrous <jan.petrous@nxp.com>
Signed-off-by: Meng Li <Meng.Li@windriver.com>