Add binding documents for the Delta TN48M CPLD drivers.
Signed-off-by: Robert Marko <robert.marko@sartura.hr>
Link: https://lore.kernel.org/r/20220131133049.77780-6-robert.marko@sartura.hrSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>