libcameraservice: fix 64-bit print format warnings

Use PRId64 from inttypes.h to print nsecs_t (int64_t)
Use %zu to print size_t

Change-Id: I135620e0388db33587a8a7da393b48a45cb7275a
diff --git a/services/camera/libcameraservice/CameraService.cpp b/services/camera/libcameraservice/CameraService.cpp
index 87027f7..fbc56b1 100644
--- a/services/camera/libcameraservice/CameraService.cpp
+++ b/services/camera/libcameraservice/CameraService.cpp
@@ -196,7 +196,7 @@
              */
         }
 
-        ALOGV("%s: After unplug, disconnected %d clients",
+        ALOGV("%s: After unplug, disconnected %zu clients",
               __FUNCTION__, clientsToDisconnect.size());
     }