This also add support for specifying a LED pin to indicate haptic status,
and also adds support for a haptic-enable pin, which is useful to turn off
the boost converter on the solenoid driver.
Without this build would fail, if a keyboard had haptic feedback enabled,
TAPPING_TOGGLE was not overridden in a config.h, and if NO_HAPTIC_MOD was
defined in config.h.
