Add PPS support to the am335x timer driver. This uses the timer hardware's

capture mode together with the timecounter's PPS polling feature to get
very accurate PPS capture without any interrupt processing (or latency).

Hardware timers 4 through 7 have associated capture-trigger input pins.
When the PPS support is compiled in the code automatically chooses the
first timer it finds that has the capture-trigger pin set to input mode
(this is configured via the fdt data).

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