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In devices where the U-Boot is used as a secondary bootloader, we rely on the device's primary bootloader to implement CNTFRQ_EL0. However, this reliance may lead to a non-functional timer in broken firmware. For instance, some versions of Samsung's S-Boot don't implement it. It's also not possible to set it in the U-Boot, because it's booted in a lower exception level. CNTFRQ_EL0 is reported to be 0. Use gd->arch.timer_rate_hz to override the queried value if set. This setting needs to be done in the board file, preferrably in timer_init(). This feature is present only when the CONFIG_ARMV8_CNTFRQ_BROKEN is enabled. Signed-off-by: Kaustabh Chakraborty <kauschluss@disroot.org>