Improved STM32F4xx/stm32_registry.h completing STM32F446 support Added ST_NUCLEO144_F446ZE board files Added RT-STM32F446ZE-NUCLEO144 demo git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@9307 35acf78f-673a-0410-8e92-d51de3d6d3f4