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2019-06-04T15:15:37.982748Z
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MFC r345581:

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.

Sponsored by:	DARPA, AFRL

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