Merge branch 'Support-programmable-pins-for-Ocelot-PTP-driver'

Yangbo Lu says:

====================
Support programmable pins for Ocelot PTP driver

The Ocelot PTP clock driver had been embedded into ocelot.c driver.
It had supported basic gettime64/settime64/adjtime/adjfine functions
by now which were used by both Ocelot switch and Felix switch.

This patch-set is to move current ptp clock code out of ocelot.c driver
maintaining as a single ocelot_ptp.c driver, and to implement 4
programmable pins with only PTP_PF_PEROUT function for now.
The PTP_PF_EXTTS function will be supported in the future, and it should
be implemented separately for Felix and Ocelot, because of different
hardware interrupt implementation in them.

Changes for v2:
	- Put PTP driver under drivers/net/ethernet/mscc/.
	- Dropped MAINTAINERS patch. Kept original maintaining.
	- Initialized PTP separately in ocelot/felix platforms.
	- Supported PPS case in programmable pin.
	- Supported disabling pin function since deadlock is fixed by Richard.
	- Returned -EBUSY if not finding pin available.
Changes for v3:
	- Re-sent.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

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