drivers: flash: flash_mcux_flexspi_nor: move device data to RAM
drivers: flash: flash_mcux_flexspi_nor: move device data to RAM

flexspi driver should not interact with flash whenever possible, and
should never use flash while in a critical write or erase section.
Move device data to RAM to prevent this read-while-write hazard.

Signed-off-by: Daniel DeGrasse <002dd1d4ac44ebb71088aae93501e62b784ed821@nxp.com>

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