arm64/vmm: Add the VHE exception and switcher files

These just need to include the common code with macros to ensure it is
built correctly.

Sponsored by: Arm Ltd
Differential Revision: https://revi

arm64/vmm: Add the VHE exception and switcher files

These just need to include the common code with macros to ensure it is
built correctly.

Sponsored by: Arm Ltd
Differential Revision: https://reviews.freebsd.org/D46083

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