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/utility/crossystem_main.c b/utility/crossystem_main.c
index 7289ad1..4cf875a 100644
--- a/utility/crossystem_main.c
+++ b/utility/crossystem_main.c
@@ -66,6 +66,7 @@
    "Times to try OS firmware update (writable, inside kern_nv)"},
   {"vbtest_errfunc", CAN_WRITE, "Verified boot test error function (writable)"},
   {"vbtest_errno", CAN_WRITE, "Verified boot test error number (writable)"},
+  {"loc_idx", CAN_WRITE, "Localization index for firmware screens (writable)"},
   /* Fields not shown in a print-all list */
   {"vdat_lfdebug", IS_STRING|NO_PRINT_ALL,
    "LoadFirmware() debug data (not in print-all)"},