Rename [Cl|Cpu]GemmConvolution to [Cl|Gpu]GemmConv2d

Renaming the gemm-based convolution operators to accomodate for new
operators with higher convolution dimensonality

Signed-off-by: Georgios Pinitas <georgios.pinitas@arm.com>
Change-Id: Id2f2cf11404221f0e87baa0e5d08ad5d63eaf78e
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/6113
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
diff --git a/arm_compute/runtime/NEON/functions/NEGEMMConvolutionLayer.h b/arm_compute/runtime/NEON/functions/NEGEMMConvolutionLayer.h
index fe866dd..cf5fb82 100644
--- a/arm_compute/runtime/NEON/functions/NEGEMMConvolutionLayer.h
+++ b/arm_compute/runtime/NEON/functions/NEGEMMConvolutionLayer.h
@@ -41,7 +41,7 @@
 
 /** Basic function to compute the convolution layer. This function calls the following kernels/functions:
  *
- * -# @ref cpu::CpuGemmConvolution
+ * -# @ref cpu::CpuGemmConv2d
  *
  */
 class NEGEMMConvolutionLayer : public IFunction