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

host/arch/x86/lib/crossystem_arch.c

 /* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include <stdio.h>
 #include <string.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <unistd.h>
@@ skipping 511 matching lines @@
     if (-1 == value)
       value = VbGetCmosRebootField(CMOSRF_TRY_B);
   }
 
   return value;
 }
 
 
 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");
   } else if (!strcasecmp(name,"ro_fwid")) {
     return ReadFileString(dest, size, ACPI_BASE_PATH "/FRID");
   } else if (!strcasecmp(name,"mainfw_act")) {
     switch(ReadFileInt(ACPI_BINF_PATH ".1")) {
       case 0:
         return StrCopy(dest, "recovery", size);
       case 1:
@@ skipping 39 matching lines @@
 
   return -1;
 }
 
 
 int VbSetArchPropertyString(const char* name, const char* value) {
   /* If there were settable architecture-dependent string properties,
    * they'd be here. */
   return -1;
 }