y2: enable clocks before probe

Catch-22: On Yukon EX (88E8071) need to have internal clocks enabled
before reading chip id. It is harmless on other chips.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
†wąŒ–