arch/x86/smbios: Add DRAM manufacturer

Add Ramaxel DRAM manufacturer id.

Tested on Lenovo T520 and DDR3-1600 DIMM (RMT3170eb86e9w16).
The manufacturer name shows up in dmidecode.

Change-Id: I14cdc82c09f0f990e2ba18083748d11d79e53874
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/15183
Tested-by: build bot (Jenkins)
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-by: Alexander Couzens <lynxis@fe80.eu>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

src/arch/x86/smbios.c

@@ -131,6 +131,10 @@ void smbios_fill_dimm_manufacturer_from_id(uint16_t mod_id, struct smbios_type17
 			t->manufacturer = smbios_add_string(t->eos,
 							    "Crucial");
 			break;
+		case 0x4304:
+			t->manufacturer = smbios_add_string(t->eos,
+							    "Ramaxel");
+			break;
 		case 0x4f01:
 			t->manufacturer = smbios_add_string(t->eos,
 							    "Transcend");