log when waiting on a servicemanager

Since vndservicemanager is no longer installed by default, this gets hit
on those devices.

Bug: 156571068
Test: TH
Change-Id: I31af865326e9a69042e5c53b63637b95d6de9ad1
diff --git a/libs/binder/IServiceManager.cpp b/libs/binder/IServiceManager.cpp
index dab7ad5..afb60da 100644
--- a/libs/binder/IServiceManager.cpp
+++ b/libs/binder/IServiceManager.cpp
@@ -95,6 +95,7 @@
         while (sm == nullptr) {
             sm = interface_cast<AidlServiceManager>(ProcessState::self()->getContextObject(nullptr));
             if (sm == nullptr) {
+                ALOGE("Waiting 1s on context object on %s.", ProcessState::self()->getDriverName().c_str());
                 sleep(1);
             }
         }