Squashed commit of the following:
arch/arm/src/max326xx/max32660/max32660_spim.c: A few updates tot he SPI master driver. Still incomplete and does not even compile.
Update some comments
arch/arm/src/max326xx: Clean up some general build issues. Still STM32 code posing as MAX32660.
arch/arm/src/max326xx: Starting SPI driver. Initial commit is just the STM32 SPI driver with name changes.
Squashed commit of the following:
arch/arm/src/max326xx and configs/max32660-evsys/nsh/defconfig: Work out some issues related to MAX326xx configuration.
configs/max32660-evsys: Add unverified board support framework.