Change macbook air to use a pre-dumped SPD.

MBA has a soldered RAM without SPD, so you need to use stored SPD.

Change-Id: I0205e6c65ccbfe7764c12c815e60801a3c3623a5
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/11841
Tested-by: build bot (Jenkins)
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
diff --git a/src/mainboard/apple/macbookair4_2/Makefile.inc b/src/mainboard/apple/macbookair4_2/Makefile.inc
index 6064cea..555581c 100644
--- a/src/mainboard/apple/macbookair4_2/Makefile.inc
+++ b/src/mainboard/apple/macbookair4_2/Makefile.inc
@@ -1,3 +1,7 @@
 romstage-y += early_southbridge.c
 romstage-y += gpio.c
 ramstage-y += gnvs.c
+
+cbfs-files-y += spd.bin
+spd.bin-file := spd.bin
+spd.bin-type := spd