drivers: flash: stm32: qspi: move prepare cmd is enable check
drivers: flash: stm32: qspi: move prepare cmd is enable check

Moves IS_ENABLE check from prepare program and read to the caller.

Signed-off-by: Georgij Cernysiov <bd22e7942bc8beaebb3a0cc77ee92e4585e26366@gmail.com>

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