Add crossystem loc_idx

Change-Id: I9fdedabd02b11e5623b9417f24dc388ce092548c

R=wfrichar@chromium.org
BUG=chromium-os:14069
TEST=manual

crossystem loc_idx=3
crossystem loc_idx    # prints 3
crossystem loc_idx=0
crossystem loc_idx    # prints 0

Review URL: http://codereview.chromium.org/6826057
diff --git a/host/lib/crossystem.c b/host/lib/crossystem.c
index 1c3fcc2..7ad5d80 100644
--- a/host/lib/crossystem.c
+++ b/host/lib/crossystem.c
@@ -359,6 +359,8 @@
     value = VbGetNvStorage(VBNV_KERNEL_FIELD);
     if (value != -1)
       value &= KERN_NV_FWUPDATE_TRIES_MASK;
+  } else if (!strcasecmp(name,"loc_idx")) {
+    value = VbGetNvStorage(VBNV_LOCALIZATION_INDEX);
   }
   /* Other parameters */
   else if (!strcasecmp(name,"cros_debug")) {
@@ -432,6 +434,8 @@
     kern_nv &= ~KERN_NV_FWUPDATE_TRIES_MASK;
     kern_nv |= (value & KERN_NV_FWUPDATE_TRIES_MASK);
     return VbSetNvStorage(VBNV_KERNEL_FIELD, kern_nv);
+  } else if (!strcasecmp(name,"loc_idx")) {
+    return VbSetNvStorage(VBNV_LOCALIZATION_INDEX, value);
   }
 
   return -1;