mb/gigabyte/ga-g41m-es2l: Remove PCI disable on PEG bridge

Although the goal was to hide the ME device by disabling
the PCI bridge, the original comment that this bridge was ME related
was a mistake, this bridge is for PEG not for ME.
We still need this PCI bridge "on" to enable pci express graphics
add-on cards.

Change-Id: Ibf322136097d77a8e7c05dcb14f72da938187a0a
Signed-off-by: Damien Zammit <damien@zamaudio.com>
Reviewed-on: https://review.coreboot.org/16496
Tested-by: build bot (Jenkins)
Reviewed-by: Nico Huber <nico.h@gmx.de>

src/mainboard/gigabyte/ga-g41m-es2l/devicetree.cb

@@ -28,7 +28,6 @@ chip northbridge/intel/x4x		# Northbridge
     device pci 0.0 on			# Host Bridge
       subsystemid 0x1458 0x5000
     end
-    device pci 1.0 off end		# PCI Bridge to Management Engine
     device pci 2.0 on 			# Integrated graphics controller
       subsystemid 0x1458 0xd000
     end