Clean-up boards/cc2538dk/Makefile
Remove Copyright notices from Makefiles.
Add UART0 module support, similar to the STM32F series.
Add low-level GPIO set/clear/toggle macros.
Use low-level GPIO macros to control the LEDs instead of the periph/gpio API.
Eliminate unused LED pin definitions.
Redefine UART ISR functions. Eliminate UART_0_ISR, UART_1_ISR, and uart_index.
Set UART_NUMOF = 1.
Add some memory map definitions like cpu/stm32f4.
Eliminate system_cc2538.c, initialize the vector table base address, and set the PendSV interrupt priority to the lowest possible.
Move OBJDUMPFLAGS into boards/cc2538dk/Makefile.include
Eliminate redundant $(RIOTCPU)/$(CPU) include path.
Eliminate the thread_yield() call in the hwtimer irq_handler.
Eliminate ISR_ENTER() and ISR_EXIT() in dead-end ISR functions.
Add trailing newline to cpu/cc2538/include/soc-adc.h
Fix group definitions.