arm: dts: ls1028a: sync the fsl-ls1028a.dtsi with linux

arm: dts: ls1028a: sync the fsl-ls1028a.dtsi with linux

Now that everything is prepared, copy the fsl-ls1028a.dtsi from the
linux kernel v5.14.12.

Notable changes:
 - second watchdog added
 - the number of chip selects of the SPI controller is now correct and
   reflects what the hardware offers
 - the LPUARTs have the correct clock parent
 - USB controllers are enabled by default, which was already the case
   before this sync because all board enabled all the USB controller
   nodes. A linux patch to fix this is pending.
 - the eSDHC controller changes from big-endian to little-endian, but
   that property seems to be not used at all.

Signed-off-by: Michael Walle <michael@walle.cc>
Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>