Added a copy of some files to start with porting...
Added a core description file for ARM Cortex-M4 CPUs.
Modified Makefile to be able to build STM32 platform. Added some basic configuration files and gcc config files as well as a modified kernel-post Makefile for STM32F4 platform. Now we are able to build files contained in the sys/stm32/baremetal folder. Now this would be a really good starting point to think about a memory map for ARM Cortex core.