The PHY debug code is useful while working specifically with the PHY
state machine, but in general the frequent, periodic nature of the
output is a hinderance. Turn down the verbosity, leave a local define
available for anyone who specifically needs to see the PHY state
machine debug.
Change-Id: I40e59b6df5c29702813d3a554ea9e795a3761c65
Signed-off-by: Marcus Shawcroft <marcus.shawcroft@arm.com>