spi: amd: Fix SPI_SPD7 value

According to data sheet SPI_SPD7 should be set to 7.

Signed-off-by: Vitaly Rodionov <vitalyr@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20221104100637.13376-1-vitalyr@opensource.cirrus.com


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