board: ls1088a: update ifc node name to be memory-controller

IFC-NOR and QSPI are muxed on SoC.
So disable IFC node in dts if QSPI is enabled or disable QSPI node in dts
in case QSPI is not enabled.
"ifc/nor" will be changed to "memory-controller/nor" in linux. So need to
modify "ifc/nor" to "memory-controller/nor" in fdt_path_offset().

Signed-off-by: Jianpeng Bu <jianpeng.bu@nxp.com>
[Rebased]
Signed-off-by: Priyanka Jain <priyanka.jain@nxp.com>