arm64: dts: ls1046a: Update QSPI node properties of ls1046ardb

Update the compatibles to use jedec,spi-nor.
Also update the max-frequency to 50MHz and spi-tx-bus-width to 1.

Align the QSPI node with other similar boards like(ls1088ardb,
ls1046afrwy) as per bindings.

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>