COMPMID-518 - Bare metal support

Change-Id: Ida6d3dc46476fd9a67b5860e5e5bf8b848a8ac23
Reviewed-on: http://mpd-gerrit.cambridge.arm.com/85981
Reviewed-by: Georgios Pinitas <georgios.pinitas@arm.com>
Tested-by: Kaizen <jeremy.johnson+kaizengerrit@arm.com>
Reviewed-by: Moritz Pflanzer <moritz.pflanzer@arm.com>
diff --git a/src/core/NEON/kernels/NEMeanStdDevKernel.cpp b/src/core/NEON/kernels/NEMeanStdDevKernel.cpp
index 579c46f..cb32a3b 100644
--- a/src/core/NEON/kernels/NEMeanStdDevKernel.cpp
+++ b/src/core/NEON/kernels/NEMeanStdDevKernel.cpp
@@ -141,7 +141,7 @@
     const float num_pixels = _input->info()->dimension(0) * _input->info()->dimension(1);
 
     // Merge sum and calculate mean and stddev
-    std::unique_lock<std::mutex> lock(_mtx);
+    std::unique_lock<arm_compute::Mutex> lock(_mtx);
 
     *_global_sum += vget_lane_u64(local_sum, 0);