shill: fix DHCPv6 configuration key typo

DBUS configuration key string for address lease time is incorrect,
so fix it.

BUG=None
TEST=emerge-$BOARD shill

Change-Id: I9ae38c4de49120af83646476093b2b3b88bd75a6
Reviewed-on: https://chromium-review.googlesource.com/281222
Tested-by: Zeping Qiu <zqiu@chromium.org>
Reviewed-by: Paul Stewart <pstew@chromium.org>
Commit-Queue: Zeping Qiu <zqiu@chromium.org>
diff --git a/shill/dhcp/dhcpv6_config.cc b/shill/dhcp/dhcpv6_config.cc
index 479f43e..9cabf84 100644
--- a/shill/dhcp/dhcpv6_config.cc
+++ b/shill/dhcp/dhcpv6_config.cc
@@ -41,7 +41,7 @@
 const char DHCPv6Config::kConfigurationKeyDomainSearch[] = "DHCPv6DomainSearch";
 const char DHCPv6Config::kConfigurationKeyIPAddress[] = "DHCPv6Address";
 const char DHCPv6Config::kConfigurationKeyIPAddressLeaseTime[] =
-    "DHCPv6IPAddressLeaseTime";
+    "DHCPv6AddressLeaseTime";
 const char DHCPv6Config::kConfigurationKeyServerIdentifier[] =
     "DHCPv6ServerIdentifier";