drivers: flash: spi_nor: Remove page alignment requirement for R/W
drivers: flash: spi_nor: Remove page alignment requirement for R/W

For flash R/W, the start address need not be aligned on a page size.

Signed-off-by: Rajavardhan Gundi <b08addc5b57f0413e0a4ff6bc495295037640485@intel.com>

zephyrproject-rtos/zephyr,Vudentz/zephyr,Vudentz/zephyr,GiulianoFranchetto/zephyr,zephyrproject-rtos/zephyr,punitvara/zephyr,Vudentz/zephyr,GiulianoFranchetto/zephyr,explora26/zephyr,punitvara/zephyr,galak/zephyr,finikorg/zephyr,galak/zephyr,nashif/zephyr,nashif/zephyr,nashif/zephyr,galak/zephyr,ldts/zephyr,explora26/zephyr,GiulianoFranchetto/zephyr,ldts/zephyr,GiulianoFranchetto/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,explora26/zephyr,finikorg/zephyr,ldts/zephyr,explora26/zephyr,GiulianoFranchetto/zephyr,Vudentz/zephyr,punitvara/zephyr,finikorg/zephyr,finikorg/zephyr,explora26/zephyr,finikorg/zephyr,Vudentz/zephyr,Vudentz/zephyr,galak/zephyr,nashif/zephyr,zephyrproject-rtos/zephyr,ldts/zephyr,nashif/zephyr,punitvara/zephyr,ldts/zephyr,zephyrproject-rtos/zephyr,punitvara/zephyr