libqti-perfd-client: Remove namespace declaration

It's pointless when using extern "C".

Change-Id: Ibdf9f06a70aa3a75687b33781c78cf2172bb334d
diff --git a/libqti-perfd-client/client.cpp b/libqti-perfd-client/client.cpp
index 542a8b6..bb6f812 100644
--- a/libqti-perfd-client/client.cpp
+++ b/libqti-perfd-client/client.cpp
@@ -6,11 +6,9 @@
 
 #include <stdint.h>
 
-namespace android {
-    extern "C" void perf_get_feedback() {}
-    extern "C" void perf_hint() {}
-    extern "C" void perf_lock_acq() {}
-    extern "C" void perf_lock_cmd() {}
-    extern "C" void perf_lock_rel() {}
-    extern "C" void perf_lock_use_profile() {}
-}
+extern "C" void perf_get_feedback() {}
+extern "C" void perf_hint() {}
+extern "C" void perf_lock_acq() {}
+extern "C" void perf_lock_cmd() {}
+extern "C" void perf_lock_rel() {}
+extern "C" void perf_lock_use_profile() {}