Olimex LPC-H3131: Drop loops-per-second by a factor of 4. Why is the H3131 only 25% as fast as the EA3131 at the same clocking?

Olimex LPC_H3131:  Add GPIO support for LEDs and for USB host power enable and overcurrent detection.

Alloc CONFIG_FS_READABLE/WRITABLE to be defined in Kconfig files while preserving backward compatibility with legacy configurations (for the time being)