Revert "spi: zynq_qspi: Use dummy buswidth in dummy byte calculation"

Revert "spi: zynq_qspi: Use dummy buswidth in dummy byte calculation"

This reverts commit e6b9aa1bf534dbb8c7e1777f5486e808a5d5767a. The
commit wrongly divides the dummy bytes by dummy bus width to calculate
the dummy bytes. The framework already converts the dummy cycles to the
number of bytes and the controller use the SPI flash command to
determine the dummy cycles via the address width.

Signed-off-by: Stefan Herbrechtsmeier <stefan.herbrechtsmeier@weidmueller.com>
Acked-by: Ashok Reddy Soma <ashok.reddy.soma@amd.com>
Link: https://lore.kernel.org/r/20230427065355.7413-1-stefan.herbrechtsmeier-oss@weidmueller.com
Signed-off-by: Michal Simek <michal.simek@amd.com>