K64F - UART_NUM fix in a condition
Merge pull request #705 from 0xc0170/fix_issue#704

Targets: K64F - UART_NUM fix in a condition
[export][MTS_DRAGONFLY_F411RE] added iar support for DRAGONFLY
[mbed][MTS_DRAGONFLY_F411RE] added platform support files and dirs built gcc executable NOT working
[mbed][MTS_DRAGONFLY_F411RE] assigned board pinout names
[mbed][MTS_DRAGONFLY_F411RE] added pin definitions
Merge branch 'DEVDRAGONFLY' of https://github.com/vinnierabbit/mbed into DEVDRAGONFLY

Conflicts:
	libraries/mbed/targets/hal/TARGET_STM/TARGET_MTS_DRAGONFLY_F411RE/PeripheralNames.h
	libraries/mbed/targets/hal/TARGET_STM/TARGET_MTS_DRAGONFLY_F411RE/PinNames.h
[mbed][MTS_DRAGONFLY_F411RE] added board pin definitions