This commit adds LiteX SoC Builder clock control driver for MMCM
module. It gives ability to change frequency, phase and duty cycle
on up to 7 clock outputs.
Signed-off-by: Pawel Czarnecki <pczarnecki@internships.antmicro.com>
Signed-off-by: Mateusz Holenko <mholenko@antmicro.com>
