andrew 75b9c15222 Support the EFI Runtime Services on arm64. As with amd64 we use the 1:1
mapping. This uses the new common code shared with amd64.

The RTC should only be accessed via EFI. There is no locking around it as
the spec only has this as a requirement for the PC-AT CMOS device.

Reviewed by:	kib, imp
Sponsored by:	DARPA, AFRL
Differential Revision:	https://reviews.freebsd.org/D12595
2017-10-10 13:05:26 +00:00
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