Revert "mtd: spi-nor: add support to non-uniform SFDP SPI NOR flash memories"

This reverts commit 79ac594.

There are slightly different changes between what we applied back in
linux4sam-6.0 and what reached mainline. Revert the 4BAIT, SMPT and
non-uniform erase support and backport the support and fixes from
mainline.

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

Author: ambarus