C027 specific interface changes 

u-blox changes (only if defined BOARD_UBLOX_C027):
- do not start the start if the target is not powered (PIN_nRESET_IN remains low). MDEB disk is not shown. 
- Production: writing a file called "~AUTOCRP.bin" will have the LPC11U35 enter ISP.
- Usability: writing a file called "~AUTORST.bin" will make program the target and immediately start it without disconnecting the usb devices.
 
generic change:
- Bug Fix: masking of endpoint direction bit before using as shift index