nb/intel/ironlake: Specify supported memory type

Change-Id: Ib1bf132f248d1f3c42d32f884f09687964a0c6f2
Signed-off-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/71584
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/northbridge/intel/ironlake/Kconfig

@@ -8,6 +8,11 @@ config NORTHBRIDGE_INTEL_IRONLAKE
 	select INTEL_GMA_ACPI
 	select CACHE_MRC_SETTINGS
 	select HAVE_DEBUG_RAM_SETUP
+	select NO_DDR5
+	select NO_LPDDR4
+	select NO_DDR4
+	select NO_DDR2
+	select USE_DDR3
 
 if NORTHBRIDGE_INTEL_IRONLAKE