AMD Northbridge LX: convert spd_read_byte() to non-static version

Change-Id: Ie329606852dfd7109acb694e9a9ff851b023cc63
Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com>
Reviewed-on: http://review.coreboot.org/3369
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
diff --git a/src/mainboard/pcengines/alix1c/romstage.c b/src/mainboard/pcengines/alix1c/romstage.c
index 165940d..3bed6b1 100644
--- a/src/mainboard/pcengines/alix1c/romstage.c
+++ b/src/mainboard/pcengines/alix1c/romstage.c
@@ -80,7 +80,7 @@
 	[SPD_tRRD] = 10,
 };
 
-static u8 spd_read_byte(u8 device, u8 address)
+int spd_read_byte(unsigned int device, unsigned int address)
 {
 	print_debug("spd_read_byte dev ");
 	print_debug_hex8(device);