clk: imx8mn: Use common 1443X/1416X PLL clock structure

Use common 1413X/1416X PLL clock structure to save a lot
of duplicated code on i.MX8MN clock driver.

Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Reviewed-by: Leonard Crestez <leonard.crestez@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>