configs: sama5d27_wlsom1_ek: mmc: Enable SPI NOR ethaddr retrieval

Enable the SPI NOR SFDP support and the Microchip QSPI driver.
CONFIG_SPI_FLASH_SFDP_SUPPORT enables the SFDP Vendor parser,
and for the SST case, the retrieval of the ethaddr from the
SPI NOR flash.

While touching the SPI NOR logic, sync with the
sama5d27_wlsom1_ek_qspiflash_defconfig and enable
CONFIG_SPI_FLASH_SPANSION.

Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>