Drop driver-y from GM45/ICH9/RK9

This broke because those components were not yet
committed when the patch to drop the driver class
was made.

Change-Id: I29948223503a6c4b196eafa169c064cd26da1be1
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/1934
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Tested-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/northbridge/intel/gm45/Makefile.inc

@@ -33,7 +33,7 @@ romstage-$(CONFIG_IOMMU) += iommu.c
 
 ramstage-$(CONFIG_GENERATE_ACPI_TABLES) += acpi.c
 
-driver-y += ram_calc.c
-driver-y += northbridge.c
+ramstage-y += ram_calc.c
+ramstage-y += northbridge.c
 
 smm-$(CONFIG_HAVE_SMI_HANDLER) += delay.c