powerpc/time: Use clocksource_register_hz
Use clocksource_register_hz which calculates the shift/mult factors for us. Also remove the shift = 22 assumption in vsyscall_update - thanks to Paul Mackerras and John Stultz for catching that. Signed-off-by: NAnton Blanchard <anton@samba.org> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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