There is now an helper function to round the rate when the
divider is read-only. Let's use it
Signed-off-by: NJerome Brunet <jbrunet@baylibre.com>
Signed-off-by: NMichael Turquette <mturquette@baylibre.com>
Signed-off-by: NStephen Boyd <sboyd@kernel.org>