dts: s32g27a: pfe: refactor reserved memory across targets

commit  39084f014e29bc463011ffec5a291112ebe20077 from
https://source.codeaurora.org/external/autobsps32/linux



The reserved-memory was moved to the basic include
file fsl-s32g274a.dtsi to not duplicate the same
entry in all targets

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