armv8: ls1043a: disable IFC in SPL only when QSPI is used

Current u-boot disables IFC support for SD boot on all ls1043a
boards. Actually IFC only conflicts with QSPI on ls1043a hardware.
Only when QSPI is used, IFC should be disabled. Otherwise,
the u-boot with ls1043aqds_sdcard_ifc_defconfig would not work.

Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>