KVM/arm fixes for Linux 5.7, take #2

- Fix compilation with Clang
- Correctly initialize GICv4.1 in the absence of a virtual ITS
- Move SP_EL0 save/restore to the guest entry/exit code
- Handle PC wrap around on 32bit guests, and narrow all 32bit
  registers on userspace access
-----BEGIN PGP SIGNATURE-----
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=455e
-----END PGP SIGNATURE-----