K 10
svn:author
V 2
br
K 8
svn:date
V 27
2019-03-27T16:26:03.454878Z
K 7
svn:log
V 310
Grab timer frequency from FDT.

RISC-V timer has no dedicated DTS node and we have to get timer
frequency from cpus node.

Tested on Government Furnished Equipment (GFE) cores synthesized
on Xilinx VCU118.

Reviewed by:	markj
Sponsored by:	DARPA, AFRL
Differential Revision:	https://reviews.freebsd.org/D19727

END