This patch converts the code to use rational best approximation algorithm which
is much more precise.
Suggested-by: NStephen Boyd <sboyd@codeaurora.org>
Reviewed-by: NHeikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: NStephen Boyd <sboyd@codeaurora.org>