fix: remove private include from public header

Fixes: #1177
Change-Id: I7b66b8d3faa0673ee11230e403108a50a5b15e82
Signed-off-by: Siddhartha Menon <siddhartha.menon@arm.com>

Author: Sqvid

arm_compute/runtime/experimental/operators/CpuQuantize.h

@@ -31,8 +31,6 @@
 #include "arm_compute/core/ITensorInfo.h"
 #include "arm_compute/runtime/NEON/INEOperator.h"
 
-#include "src/cpu/ICpuOperator.h"
-
 #include <memory>
 
 /*