Add counter_push_event() to notify user space about new pulses

Link: https://lore.kernel.org/r/20220203135727.2374052-3-o.rempel@pengutronix.deSigned-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com>
Link: https://lore.kernel.org/r/9da3460113b5092e8658e12f23578567aab7cc5f.1647373009.git.vilhelm.gray@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>