i.MX clocks changes for 6.5

- Remove CLK_SET_RATE_PARENT flag from LDB clocks on i.MX6SX
- Keep UART clocks enabled during kernel boot if earlycon is set
- Drop the imx_unregister_clocks as there are no users for it
- Switch to _safe iterator on imx_clk_scu_unregister to avoid use after free
- Add determine_rate op to the imx8m composite clock
- Use device managed API for iomap and kzalloc for i.MXRT1050,
  i.MX8MN, i.MX8MP and i.MX93 clock controller drivers
- Add missing interrupt DT property for the i.MX8M clock controller
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