A few MIPS fixes for 4.18:

  - A GPIO device name fix for a regression in v4.15-rc1.

  - An errata workaround for the BCM5300X platform.

  - A fix to ftrace function graph tracing, broken for a long time with
    the fix applying cleanly back as far as v3.17.

  - Addition of read barriers to in{b,w,l,q}() functions, matching
    behavior of other architectures & mirroring the equivalent addition
    to read{b,w,l,q} in v4.17-rc2.

Plus changes to wire up new syscalls introduced in the 4.18 cycle:

  - Restartable sequences support is added, including MIPS support in
    the selftests.

  - io_pgetevents is wired up.
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