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Dynamically configure timers' base frequency for Armada 38x

Description

Dynamically configure timers' base frequency for Armada 38x

Instead of using 'clock-frequency' device tree property for global/twd
mpcore timers of Armada 38x SoCs, set it in platform_late_init stage
with arm_tmr_change_frequency() function.

Reviewed by: cognet (mentor)
Approved by: cognet (mentor)
Obtained from: Semihalf
Differential Revision: https://reviews.freebsd.org/D11881

Details