I recently came across an ar7 device which has the vlynq hardwired

I recently came across an ar7 device which has the vlynq hardwired
so that the clocks are always generated by the remote device
instead of the local one.

Upon initialization the current version of vlynq driver disables
remote clock generation and causes the entire bus to hang on my
device.

This patch adds support for detecting which device (local or remote)
is responsible of clock generation and implements clock
initialization based on detection result.

Signed-off-by: Antti Seppala <a.seppala at gmail.com>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@16049 3c298f89-4303-0410-b956-a3cf2f4a3e73