CIMx: Allow #define LEGACY_FREE overrides

For legacy free AMD systems, the #define LEGACY_FREE cannot
currently be overridden.  This patch allows the platform_cfg.h
to override that.  (I know we want to get away from that, but
for now...)

Also allow BIOS_SIZE to be overridden on SB700 cimx based
platforms.

Change-Id: I570115248bcbc686062bfb66acb56208240b847a
Signed-off-by: Martin L Roth <martin@se-eng.com>
Reviewed-on: http://review.coreboot.org/1018
Tested-by: build bot (Jenkins)
Reviewed-by: Marc Jones <marcj303@gmail.com>
diff --git a/src/vendorcode/amd/cimx/sb800/OEM.h b/src/vendorcode/amd/cimx/sb800/OEM.h
index b38acba..c2d8670 100644
--- a/src/vendorcode/amd/cimx/sb800/OEM.h
+++ b/src/vendorcode/amd/cimx/sb800/OEM.h
@@ -33,7 +33,9 @@
 #ifndef BIOS_SIZE
   #define BIOS_SIZE                      0x04   //04 - 1MB
 #endif
-#define LEGACY_FREE                    0x00
+#ifndef LEGACY_FREE
+	#define LEGACY_FREE                    0x00
+#endif
 //#define ACPI_SLEEP_TRAP                0x01
 //#define SPREAD_SPECTRUM_EPROM_LOAD     0x01