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.
arch/arm/src/max326xx/max32660/max32660_serial.c: Add a mostly commented out serial driver. With this, we can accomplish a complete build with many warnings for 'Missing logic'
configs/max32660-evsys/src/max326_button.c: Add support for the on-board button.
arch/arm/src/max326xx: Add a mostly empty max326_lowputc.c file mostly so that we can get further in the compilation. Fixed several more compile errors revealed by this.
arch/arm/src/max326xx: Add peripheral clock control header file.
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.