Make getCallingUid/Pid const.

Change-Id: I1853b21eaa45d85274189dfd72f73fec48d0d6b7
diff --git a/libs/binder/IPCThreadState.cpp b/libs/binder/IPCThreadState.cpp
index 5a38b95..5951a3f 100644
--- a/libs/binder/IPCThreadState.cpp
+++ b/libs/binder/IPCThreadState.cpp
@@ -362,12 +362,12 @@
     return err;
 }
 
-int IPCThreadState::getCallingPid()
+int IPCThreadState::getCallingPid() const
 {
     return mCallingPid;
 }
 
-int IPCThreadState::getCallingUid()
+int IPCThreadState::getCallingUid() const
 {
     return mCallingUid;
 }