this allows ports to specify a freertos port outside the FreeRTOS-Kernel lib directory, which would otherwise not be possible
Signed-off-by: Rafael Silva <rafaelsilva@ajtec.pt>
create local register access struct and move mcu specific code
in preparation of support for other mcu families that use the LINK usb core
Signed-off-by: Rafael Silva <rafaelsilva@ajtec.pt>