shill: cellular: Extend modem enable/disable timeout.

BUG=chromium-os:32647
TEST=Unit tests, cellular_ModemControl

Change-Id: Icb52a40132d474ad69541b7611c7d64d4ddf44cd
Reviewed-on: https://gerrit.chromium.org/gerrit/38921
Reviewed-by: Arman Uguray <armansito@chromium.org>
Commit-Ready: Thieu Le <thieule@chromium.org>
Tested-by: Thieu Le <thieule@chromium.org>
diff --git a/cellular_capability.cc b/cellular_capability.cc
index b0e5b00..99aab01 100644
--- a/cellular_capability.cc
+++ b/cellular_capability.cc
@@ -24,7 +24,7 @@
 const int CellularCapability::kTimeoutConnect = 45000;
 const int CellularCapability::kTimeoutDefault = 5000;
 const int CellularCapability::kTimeoutDisconnect = 45000;
-const int CellularCapability::kTimeoutEnable = 15000;
+const int CellularCapability::kTimeoutEnable = 45000;
 const int CellularCapability::kTimeoutRegister = 90000;
 const int CellularCapability::kTimeoutScan = 120000;