Add configuration for OLIMEXINO_STM32 board.
By default, the UART console is forwarded to USART1 available on
UEXT connector. All GPIO ports available on the connecot headers
are enabled.
Change-Id: I60b3ff20ea60b5294a3a6c31f4dba0802794f9d8
Origin: Based on nucleo_f103rb board
Signed-off-by: Yannis Damigos <giannis.damigos@gmail.com>