Add configuration for Nucleo-64 F103RB board. By default, the UART
console is forwarded to USART2, available on STLink V2-1 USB
connector. All GPIO ports available on the connecot headers are
enabled.
Change-Id: I266170d1288ef27f668410c5737c46cdf716e137
Origin: Original
Signed-off-by: Maciek Borzecki <maciek.borzecki@gmail.com>