spi: atmel-quadspi: Port collected fixes from Linux v5.10 and v5.15

spi: atmel-quadspi: Port collected fixes from Linux v5.10 and v5.15

Port changes from a 4 piece patch series from Linux kernel v5.10, merged
with v5.10-rc1-83-gc732b7567d869 ("Merge series "spi: atmel-quadspi: Fix
AHB memory accesses" from Tudor Ambarus …").

Port the single fix v5.15-rc1-14-g09134c5322df9 ("spi: Fixed division by
zero warning").

Reduces differences between linux and u-boot driver.

Cc: Tudor Ambarus <tudor.ambarus@microchip.com>
Cc: Yoshitaka Ikeda <ikeda@nskint.co.jp>
Signed-off-by: Alexander Dahl <ada@thorsis.com>