arm64/vmm: Convert the handlers into ifuncs

Now we have support for both VHE and non-VHE update the handlers to
use an ifunc to decide which version to use.

Sponsored by: Arm Ltd
Differential Revis

arm64/vmm: Convert the handlers into ifuncs

Now we have support for both VHE and non-VHE update the handlers to
use an ifunc to decide which version to use.

Sponsored by: Arm Ltd
Differential Revision: https://reviews.freebsd.org/D46084

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arm64/vmm: Create functions to call into EL2

These will become ifuncs to enable VHE in a later change.

Sponsored by: Arm Ltd
Differential Revision: https://reviews.freebsd.org/D46075