kvm tools: arm: extract common timer support code for ARM cpus

The ARM V7 and V8 CPUs use the nearly identical support code for generating
timer DT nodes as they both use ARM's architected timers. T

kvm tools: arm: extract common timer support code for ARM cpus

The ARM V7 and V8 CPUs use the nearly identical support code for generating
timer DT nodes as they both use ARM's architected timers. This code is currently
duplicated for AArch32 and AArch64.

This cleanup patch generalises timer DT node generation to follow the same
pattern as for the GIC. The ability of a DT node to contain multiple compatible
strings is exploited to allow an identical DT node to be used on V7 and V8
platforms.

Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Jonathan Austin <jonathan.austin@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>

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