mb/asrock/b85m_pro4: Select MAINBOARD_USES_IFD_GBE_REGION

This board uses the in-PCH GbE controller, and its IFD has a GbE region.

Change-Id: Ifc09640b2ebd613d3d5566a13b50d36c11e3c346
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/43522
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/asrock/b85m_pro4/Kconfig

@@ -12,6 +12,7 @@ config BOARD_SPECIFIC_OPTIONS
 	select HAVE_OPTION_TABLE
 	select INTEL_GMA_HAVE_VBT
 	select MAINBOARD_HAS_LIBGFXINIT
+	select MAINBOARD_USES_IFD_GBE_REGION
 	select NORTHBRIDGE_INTEL_HASWELL
 	select SERIRQ_CONTINUOUS_MODE
 	select SOUTHBRIDGE_INTEL_LYNXPOINT