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: NAndre Przywara <andre.przywara@arm.com>
Acked-by: NRyan Harkin <ryan.harkin@linaro.org>

board/armltd/vexpress64/pcie.c

@@ -87,7 +87,7 @@ void xr3pci_set_atr_entry(unsigned long base, unsigned long src_addr,
 	writel((u32)(trsl_addr >> 32), base + XR3PCI_ATR_TRSL_ADDR_HIGH);
 	writel(trsl_param, base + XR3PCI_ATR_TRSL_PARAM);
 
-	printf("ATR entry: 0x%010lx %s 0x%010lx [0x%010llx] (param: 0x%06x)\n",
+	debug("ATR entry: 0x%010lx %s 0x%010lx [0x%010llx] (param: 0x%06x)\n",
 	       src_addr, (trsl_param & 0x400000) ? "<-" : "->", trsl_addr,
 	       ((u64)1) << window_size, trsl_param);
 }