Change AMD vendorcode build

Apply the normal method of recursively including subdirectories
for src/vendorcode. Remove redundant references under
mainboard and northbridge.

Change-Id: I914a6e262ed2abe83f407df36fe5c1af5eb4bcb0
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/468
Tested-by: build bot (Jenkins)
Reviewed-by: Kerry Sheh <shekairui@gmail.com>
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
diff --git a/src/vendorcode/Makefile.inc b/src/vendorcode/Makefile.inc
index bd55573..16c0d68 100644
--- a/src/vendorcode/Makefile.inc
+++ b/src/vendorcode/Makefile.inc
@@ -1,6 +1,2 @@
-subdirs-$(CONFIG_CPU_AMD_AGESA_FAMILY10) += $(src)/vendorcode/amd/agesa/f10
-subdirs-$(CONFIG_CPU_AMD_AGESA_FAMILY12) += $(src)/vendorcode/amd/agesa/f12
-subdirs-$(CONFIG_CPU_AMD_AGESA_FAMILY14) += $(src)/vendorcode/amd/agesa/f14
+subdirs-y += amd
 
-subdirs-$(CONFIG_SOUTHBRIDGE_AMD_CIMX_SB800) += $(src)/vendorcode/amd/cimx/sb800
-subdirs-$(CONFIG_SOUTHBRIDGE_AMD_CIMX_SB900) += $(src)/vendorcode/amd/cimx/sb900