i.MX clock changes for 5.5: - Make 1443X/1416X PLL clock structure common for reusing among i.MX8 SoCs. - A couple of imx7ulp clock multiplexer option corrections. - Drop IMX7ULP_CLK_MIPI_PLL clock, as it's a MIPI DSI local clock and shouldn't be used externally. - Add VIDEO2_PLL clock for imx8mq which is needed by DCSS when high resolutions are used. - Add missing gate clock for pll1/2 fixed dividers on i.MX8 SoCs. - Register SYS_PLL1 and SYS_PLL2 as fixed clock rather than pll14xx type of clock. - Use imx_obtain_fixed_clk_hw() to simplify i.MX6/7/8 clock driver code a little bit. - One cosmetic change on clk-pll14xx code to make variables static.