boards: mimxrt1024_evk: mcuboot support #38209
                
     Merged
            
            
          
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Adds missing Flexspi kconfig support to the board as well as a flash partition table compatible with mcuboot layout.
The flash device in the SoC dts file was missing the correct compatible binding and erase/write-block-size necessary for mcuboot. Futhermore, the device size and label is corrected to reflect the actual onboard chip.
Tested Device Firmware Upgrade over the UDP transport (see #37863 for ethernet support).