Add 'recovery_key' in Google Binary Block (GBB) utility

src/platform/vboot_reference/utility/include/gbb_utility.h

Index: src/platform/vboot_reference/utility/include/gbb_utility.h
diff --git a/src/platform/vboot_reference/utility/include/gbb_utility.h b/src/platform/vboot_reference/utility/include/gbb_utility.h
index 021eb80fcd8597d1c87d957aa041f3c78752b217..468cddf99b999aef17af6d9d1c984f6a3b6bbee2 100644
--- a/src/platform/vboot_reference/utility/include/gbb_utility.h
+++ b/src/platform/vboot_reference/utility/include/gbb_utility.h
@@ -18,6 +18,7 @@ class GoogleBinaryBlockUtil {
     PROP_HWID,      // hardware id
     PROP_ROOTKEY,   // root key
     PROP_BMPFV,     // bitmap FV
+    PROP_RCVKEY,    // recovery key
     PROP_RANGE,     // indicator of valid property range
   };
 
@@ -48,9 +49,11 @@ class GoogleBinaryBlockUtil {
   bool set_hwid(const char *hwid);      // NOTE: hwid is NUL-terminated.
   bool set_rootkey(const std::string &value);
   bool set_bmpfv(const std::string &value);
+  bool set_recovery_key(const std::string &value);
   std::string get_hwid() const { return get_property(PROP_HWID); }
   std::string get_rootkey() const { return get_property(PROP_ROOTKEY); }
   std::string get_bmpfv() const { return get_property(PROP_BMPFV); }
+  std::string get_recovery_key() const { return get_property(PROP_RCVKEY); }
 
  private:
   // clear all cached data and initialize to original state