system_api: Add EIR property in bluetooth_device

This was added in crrev.com/c/1308457

BUG=chromium:887029,b:118334521
TEST=CQ

Change-Id: If80d8fc275e485f4f1db5d3c26e804b28aeaba5a
Reviewed-on: https://chromium-review.googlesource.com/1312382
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Qiyu Hu <qiyuh@google.com>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
(cherry picked from commit f7ec755ab30a72b8edb751703422f145b86549b0)
Reviewed-on: https://chromium-review.googlesource.com/c/1361651
Reviewed-by: Miao-chen Chou <mcchou@chromium.org>
Commit-Queue: Benjamin Gordon <bmgordon@chromium.org>
Tested-by: Benjamin Gordon <bmgordon@chromium.org>

dbus/service_constants.h

diff --git a/dbus/service_constants.h b/dbus/service_constants.h
index 307119a..38eba22 100644
--- a/dbus/service_constants.h
+++ b/dbus/service_constants.h
@@ -441,6 +441,7 @@
 const char kServicesResolvedProperty[] = "ServicesResolved";
 const char kAdvertisingDataFlagsProperty[] = "AdvertisingFlags";
 const char kMTUProperty[] = "MTU";
+const char kEIRProperty[] = "EIR";
 
 // Bluetooth Device errors.
 const char kErrorNotReady[] = "org.bluez.Error.NotReady";