LS1088AQDS u-boot contains multiple DTB files:
fsl-ls1088a-qds-21-x.dtb and fsl-ls1088a-qds-29-x.dtb.
It does not use default device tree fsl-ls1088a-qds.dtb
However, the nodes updated in fsl-ls1088a-qds-u-boot.dtsi are not
included for fsl-ls1088a-qds-21-x.dts and fsl-ls1088a-qds-29-x.dts,
so fail to get any output from serial.
Signed-off-by: Ye Li <ye.li@nxp.com> Tested-by: Wei Lu <w.lu@nxp.com> Reviewed-by: Peng Fan <peng.fan@nxp.com> Signed-off-by: Peng Fan <peng.fan@nxp.com>