Add crossystem arch (reports x86 or arm, depending on platform)

host/arch/x86/lib/crossystem_arch.c

Index: host/arch/x86/lib/crossystem_arch.c
diff --git a/host/arch/x86/lib/crossystem_arch.c b/host/arch/x86/lib/crossystem_arch.c
index 1e1f75b8cc6ad94f684abaa60e2249ef0964dd5c..b8e6add597e9be5d70bc9cd1357c45a21dbff8ec 100644
--- a/host/arch/x86/lib/crossystem_arch.c
+++ b/host/arch/x86/lib/crossystem_arch.c
@@ -529,7 +529,9 @@ int VbGetArchPropertyInt(const char* name) {
 
 const char* VbGetArchPropertyString(const char* name, char* dest, int size) {
 
-  if (!strcasecmp(name,"hwid")) {
+  if (!strcasecmp(name,"arch")) {
+    return StrCopy(dest, "x86", size);
+  } else if (!strcasecmp(name,"hwid")) {
     return ReadFileString(dest, size, ACPI_BASE_PATH "/HWID");
   } else if (!strcasecmp(name,"fwid")) {
     return ReadFileString(dest, size, ACPI_BASE_PATH "/FWID");