[v2, 3/3] ptp_qoriq: support automatic configuration for ptp timer

From: Yangbo Lu <yangbo.lu@nxp.com>
Date: Wed,  1 Aug 2018 18:05:54 +0800

This patch is to support automatic configuration for ptp timer.
If required ptp dts properties are not provided, driver could
try to calculate a set of default configurations to initialize
the ptp timer. This makes the driver work for many boards which
don't have the required ptp dts properties in current kernel.
Also the users could set dts properties by themselves according
to their requirement.

Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
---
Changes for v2:
	- Dropped module_param.

Applied.