CMSIS-NN: Remove leftover kernel size defines (#1535)

diff --git a/CMSIS/NN/Source/ConvolutionFunctions/arm_convolve_1x1_s8_fast.c b/CMSIS/NN/Source/ConvolutionFunctions/arm_convolve_1x1_s8_fast.c
index 43c35a9..50657a6 100644
--- a/CMSIS/NN/Source/ConvolutionFunctions/arm_convolve_1x1_s8_fast.c
+++ b/CMSIS/NN/Source/ConvolutionFunctions/arm_convolve_1x1_s8_fast.c
@@ -32,9 +32,6 @@
 #include "arm_nnsupportfunctions.h"
 #include <stdio.h>
 
-#define DIM_KER_X (1U)
-#define DIM_KER_Y (1U)
-
 /**
  *  @ingroup groupNN
  */