If clk_enable() fails, then print a message so that the user can see
what is happening instead of silently failing to enable the clock.
Signed-off-by: NBen Dooks <ben.dooks@codethink.co.uk>
Reviewed-by: NIan Molton <ian.molton@codethink.co.uk>
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>