Add a logging after hwservicemanager becomes ready

As property service is part of init, and if init is busy with built-in
command e.g. fsck, the propety_set() won't go through until the built-in
command is finished.

Adding a log to reflect when the property is ready for HAL services.

Bug: 74437368
Test: boot
Change-Id: I5e4b6749b6a490967567939b9426b7cb351c835d
diff --git a/service.cpp b/service.cpp
index 65a94c9..17db6bc 100644
--- a/service.cpp
+++ b/service.cpp
@@ -69,6 +69,7 @@
               "HAL services will not start!\n", rc);
     }
 
+    ALOGI("hwservicemanager is ready now.");
     joinRpcThreadpool();
 
     return 0;