arm64: dts: ls208x: Remove non-compatible driver device from qspi node

Since device properties are different, so remove fsl, ls1021a-qspi.
ls1021a-qspi is to be used only for Big-endian verion of QSPI controller

Signed-off-by: Kuldeep Singh <kuldeep.singh@nxp.com>
Signed-off-by: Ashish Kumar <Ashish.Kumar@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>