spi: mxic: Select SPI_NOR type by default

The SPI_NAND bit is a (wrongly named) placeholder that is intended
to be used in the future. Right now SPI_NOR (which is currently
identical to SPI_NAND in this version of the IP) should be used in
both cases.

Suggested-by: Mason Yang <masonccyang@mxic.com.tw>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/r/20190919202504.9619-3-miquel.raynal@bootlin.com


Signed-off-by: Mark Brown <broonie@kernel.org>