drivers/iio/adc/admc: Use axiadc_configure_ring_stream() instead of axiadc_configure_ring().
drivers/iio/adc/admc: Renamed ad_mc_adc.c and ad_mc_speed.c to admc_adc.c and admc_speed.c.
drivers/iio/adc/admc: Deleted ad_mc_controller.c.