Inagua: Synchronize AMD/inagua mainboard.

AMD/persimmon mainboard code is derived from AMD/inagua mainbard.
Persimmom update a lot in the last few month, sync these modification to inagua.

Change-Id: Ia038e5a2b9550fe81bb075f31e30b98354758e9e
Signed-off-by: Kerry Sheh <shekairui@gmail.com>
Signed-off-by: Kerry Sheh <kerry.she@amd.com>
Reviewed-on: http://review.coreboot.org/542
Tested-by: build bot (Jenkins)
Reviewed-by: Marc Jones <marcj303@gmail.com>
diff --git a/src/mainboard/amd/inagua/Makefile.inc b/src/mainboard/amd/inagua/Makefile.inc
index d9fc200..8a72727 100755
--- a/src/mainboard/amd/inagua/Makefile.inc
+++ b/src/mainboard/amd/inagua/Makefile.inc
@@ -17,6 +17,13 @@
 # Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 #
 
+ifeq ($(CONFIG_AHCI_BIOS),y)
+stripped_ahcibios_id = $(call strip_quotes,$(CONFIG_AHCI_BIOS_ID))
+cbfs-files-$(CONFIG_AHCI_BIOS) += pci$(stripped_ahcibios_id).rom
+pci$(stripped_ahcibios_id).rom-file := $(call strip_quotes,$(CONFIG_AHCI_BIOS_FILE))
+pci$(stripped_ahcibios_id).rom-type := optionrom
+endif
+
 romstage-y += buildOpts.c
 romstage-y += agesawrapper.c
 romstage-y += dimmSpd.c