Keep status LEDs off when booting into ICP
Keep status LEDs off when booting into ICP

When initializing gpio at boot keep LEDs turned off.  This prevents
the LEDs from being stuck on when entering ISP mode.

This patch also removes the extra '|=' and '&=' when writing to the
SET/CLR registers since this is unnecessary.

google/DAPLink-port,google/DAPLink-port,google/DAPLink-port,google/DAPLink-port,sg-/DAPLink,sg-/DAPLink,sg-/DAPLink