drivers: spi: stm32: remove extraneous unaligned macros
drivers: spi: stm32: remove extraneous unaligned macros

Byte access is always naturally aligned; there's no need to use
UNALIGNED_GET or UNALIGNED_PUT. Those would only be needed when
supporting 16-bit data frames.

Signed-off-by: Marti Bolivar <9d90ac4c7bf6a305f6bfd81a23c7859bc883380e@linaro.org>

rsalveti/zephyr,punitvara/zephyr,zephyriot/zephyr,kraj/zephyr,fbsder/zephyr,galak/zephyr,finikorg/zephyr,rsalveti/zephyr,aceofall/zephyr-iotos,zephyrproject-rtos/zephyr,rsalveti/zephyr,Vudentz/zephyr,runchip/zephyr-cc3220,explora26/zephyr,ldts/zephyr,zephyriot/zephyr,GiulianoFranchetto/zephyr,explora26/zephyr,GiulianoFranchetto/zephyr,runchip/zephyr-cc3220,fbsder/zephyr,rsalveti/zephyr,runchip/zephyr-cc3220,ldts/zephyr,nashif/zephyr,nashif/zephyr,galak/zephyr,finikorg/zephyr,zephyriot/zephyr,aceofall/zephyr-iotos,mbolivar/zephyr,punitvara/zephyr,explora26/zephyr,mbolivar/zephyr,Vudentz/zephyr,finikorg/zephyr,nashif/zephyr,kraj/zephyr,fbsder/zephyr,mbolivar/zephyr,rsalveti/zephyr,fbsder/zephyr,runchip/zephyr-cc3220,aceofall/zephyr-iotos,zephyrproject-rtos/zephyr,runchip/zephyr-cc3220,kraj/zephyr,punitvara/zephyr,explora26/zephyr,mbolivar/zephyr,GiulianoFranchetto/zephyr,nashif/zephyr,punitvara/zephyr,aceofall/zephyr-iotos,Vudentz/zephyr,galak/zephyr,kraj/zephyr,ldts/zephyr,GiulianoFranchetto/zephyr,aceofall/zephyr-iotos,fbsder/zephyr,zephyrproject-rtos/zephyr,GiulianoFranchetto/zephyr,zephyrproject-rtos/zephyr,ldts/zephyr,Vudentz/zephyr,zephyriot/zephyr,galak/zephyr,Vudentz/zephyr,ldts/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,explora26/zephyr,finikorg/zephyr,kraj/zephyr,punitvara/zephyr,Vudentz/zephyr,galak/zephyr,zephyriot/zephyr,nashif/zephyr,mbolivar/zephyr