Use read/write operations for the mpll clocks instead of the
read-only ones.
Signed-off-by: NJerome Brunet <jbrunet@baylibre.com>
Signed-off-by: NMichael Turquette <mturquette@baylibre.com>
Link: lkml.kernel.org/r/20170309104154.28295-7-jbrunet@baylibre.com