uboot-imx

Juno: don't print PCI debug information by default

On a Juno r1 the PCI controller init routine outputs the rather boring
ATR entry information.
Do this only with DEBUG defined to avoid cluttering the user's
terminal.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Acked-by: Ryan Harkin <ryan.harkin@linaro.org>