Invalid 'run' target for STM32F429

[jserv]

The run target defined in file target/stm32f429/build.mk is not really functioned:

run: $(NAME).bin
        $(Q)qemu-system-arm \
            -semihosting \
            $(REDIRECT_SERIAL) \
            -nographic \                                                                                                                                     
            -cpu cortex-m3 \
            -machine stm32-p103 \
            -kernel $<

Since the binary is built for Cortex-M4 with STM32F4-specific peripherals, it is impossible to emulate via the above parameters.

Instead, we can reset STM32F429-derived device by invoking OpenOCD for run target.