Update GEMM assembly kernels

- Introduce Fp32 kernels with internal calculations in Bfloat16 when
fast_mode is enabled
- Improve kernel selection heuristics

Signed-off-by: Georgios Pinitas <georgios.pinitas@arm.com>
Change-Id: I68a9e7e862b6fd2721b46e0d7cc791091c4ab279
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/5965
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
diff --git a/src/core/NEON/kernels/arm_gemm/mergeresults.cpp b/src/core/NEON/kernels/arm_gemm/mergeresults.cpp
index bbfe8f2..2b712ce 100644
--- a/src/core/NEON/kernels/arm_gemm/mergeresults.cpp
+++ b/src/core/NEON/kernels/arm_gemm/mergeresults.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017-2018, 2021 Arm Limited.
+ * Copyright (c) 2017-2021 Arm Limited.
  *
  * SPDX-License-Identifier: MIT
  *
@@ -25,7 +25,6 @@
 /* As some of the merges need these headers, but are all included in the
  * arm_gemm namespace, put these headers here.  */
 #include <algorithm>
-#include <limits>
 
 #include <arm_neon.h>