Add PCIe port disable debug message

The PCIe device enable function prints when it disables a device.
The PCIe ports(bridges) use a different routine that didn't print
the message. Add it to be consistent and to provide better debug
output.

Change-Id: I8462c48e7f4930db68703f0bfb710c01c9643a98
Signed-off-by: Marc Jones <marc.jones@se-eng.com>
Reviewed-on: http://review.coreboot.org/1326
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
Tested-by: build bot (Jenkins)

src/southbridge/intel/bd82x6x/pch.c

@@ -297,6 +297,8 @@ static void pch_pcie_enable(device_t dev)
 	}
 
 	if (!dev->enabled) {
+		printk(BIOS_DEBUG, "%s: Disabling device\n",  dev_path(dev));
+
 		/*
 		 * PCIE Power Savings for PantherPoint and CougarPoint/B1+
 		 *