A few MIPS fixes for 5.3:

- Various switch fall through annotations to fixup warnings & errors
  resulting from -Wimplicit-fallthrough.

- A fix for systems (at least jazz) using an i8253 PIT as clocksource
  when it's not suitably configured.

- Set struct cacheinfo's cpu_map_populated field to true, indicating
  that we filled in cache info detected from cop0 registers & avoiding
  complaints about that info being (intentionally) missing in
  devicetree.
-----BEGIN PGP SIGNATURE-----

iIsEABYIADMWIQRgLjeFAZEXQzy86/s+p5+stXUA3QUCXUnSPBUccGF1bC5idXJ0
b25AbWlwcy5jb20ACgkQPqefrLV1AN2u3gD/TaMPczS5027R0FMXskiroUHaMG4S
JL0EYIVmfny4vwYBAIvLr5l1jEXEqegjYXFabuI5PybQlFmTZMhjauh6gKYJ
=e6fl
-----END PGP SIGNATURE-----