Update targets and pins for LPC43xx

Hi,Emilio.

This pull request updates the target and pin names for the LPC43xx port. Only two files were updated:

workspace_tools/targets.py: Substituted LPC4330 for LPC4330_M4, LPC4330_M0 and LPC1800. Support for M0 and M3 targets is still in development.

libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC43XX/PinNames.h: Corrected 3 MCU pin identifiers and added alternate GPIO pin names (GPIOx_yy) to the enumeration. MCU and GPIO pins are not equivalent on this processor family.

Thanks,
Jesus Alvarez