drivers: flexspi_nor: Fix Flash failures seen on FRDM-MCXN947

The flash_flexspi_nor_check_jedec() checks the lower 16-bits of
the manufacturer ID and installs a custom LUT table.
Add an exception to check for the whole 32-bits so we do not
accidentally install custom LUT for flash devices that do not
support this LUT table.

Signed-off-by: Mahesh Mahadevan <mahesh.mahadevan@nxp.com>