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Both the QSPI controller and the sst26vf064b flash support
quad mode, enable it.
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Link: https://lore.kernel.org/r/20200403061222.1277147-1-tudor.ambarus@microchip.com

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>