COMPMID-970 : Remove QS8 / QS16 support

Removed fixed point related code.

Change-Id: I487acf138dace3b0450e0d72ca7071eaec254566
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/137678
Tested-by: Jenkins <bsgcomp@arm.com>
Reviewed-by: Anthony Barbier <anthony.barbier@arm.com>
diff --git a/arm_compute/runtime/NEON/functions/NEArithmeticSubtraction.h b/arm_compute/runtime/NEON/functions/NEArithmeticSubtraction.h
index 751ed1a..9b460c1 100644
--- a/arm_compute/runtime/NEON/functions/NEArithmeticSubtraction.h
+++ b/arm_compute/runtime/NEON/functions/NEArithmeticSubtraction.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016, 2017 ARM Limited.
+ * Copyright (c) 2016-2018 ARM Limited.
  *
  * SPDX-License-Identifier: MIT
  *
@@ -37,17 +37,17 @@
 public:
     /** Initialise the kernel's inputs, output and conversion policy.
      *
-     * @param[in]  input1 First tensor input. Data types supported: U8/QS8/QS16/S16/F16/F32
-     * @param[in]  input2 Second tensor input. Data types supported: U8/QS8/QS16/S16/F16/F32
-     * @param[out] output Output tensor. Data types supported: U8/QS8/QS16/S16/F16/F32
+     * @param[in]  input1 First tensor input. Data types supported: U8/S16/F16/F32
+     * @param[in]  input2 Second tensor input. Data types supported: U8/S16/F16/F32
+     * @param[out] output Output tensor. Data types supported: U8/S16/F16/F32
      * @param[in]  policy Policy to use to handle overflow.
      */
     void configure(const ITensor *input1, const ITensor *input2, ITensor *output, ConvertPolicy policy);
     /** Static function to check if given info will lead to a valid configuration of @ref NEArithmeticSubtraction
      *
-     * @param[in] input1 First tensor input. Data types supported: U8/QS8/QS16/S16/F16/F32
-     * @param[in] input2 Second tensor input. Data types supported: U8/QS8/QS16/S16/F16/F32
-     * @param[in] output Output tensor. Data types supported: U8/QS8/QS16/S16/F16/F32
+     * @param[in] input1 First tensor input. Data types supported: U8/S16/F16/F32
+     * @param[in] input2 Second tensor input. Data types supported: U8/S16/F16/F32
+     * @param[in] output Output tensor. Data types supported: U8/S16/F16/F32
      * @param[in] policy Policy to use to handle overflow.
      *
      * @return a status