Andrew Turner 3e1eb51df7 Add support for arm64 to the existing arm generic timer driver:
- Add macros to handle the differences in accessing these registers on arm
   and arm64.
 - Use the fdt data to detect if we are on an ARMv7 or ARMv8.
 - Use the virtual timer by default on arm64, we may not have access to
   the physical timer.

Differential Revision:	https://reviews.freebsd.org/D2208
Reviewed by:	emaste
Sponsored by:	The FreeBSD Foundation
2015-04-04 09:07:31 +00:00
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