The main MIPS changes for a pretty light v5.3 cycle, including:

- Removal of readq & writeq for MIPS32 kernels where they would simply
  BUG() anyway, allowing drivers or other code that #ifdefs on their
  presence to work properly.

- Improvements for Ingenic JZ4740 systems, including support for the
  external memory controller & pinmuxing fixes for qi_lb60/NanoNote
  systems.

- Improvements for Lantiq systems, in particular around SMP & IPIs.

- DT updates for ralink/MediaTek MT7628a systems to probe & configure a
  bunch more devices.

- Miscellaneous cleanups & build fixes.
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