Changes to Blinky and ETRX357-DVK.h

A new macro to disable the debug has been added to the ETRX357-DVK
header file and the macro has been added to the halInternalPowerUpBoard
macro.

The Blinky project has been changed to use the standard
halInternalPowerUpBoard macro to set up PA7 and PC0 as GPIO's instead of
the GPIO_DBGCFG register.