Revert "IVGCVSW-6937 Add INT32 support to FLOOR"

This reverts commit 38b72e8de898d84a1481e242803da61009719891.

* It is not longer needed as this functionality is cover with the commit:
  IVGCVSW-6938 Do not add Floor when FloorDiv is int32 in Tfliteparser

Signed-off-by: Teresa Charlin <teresa.charlinreyes@arm.com>
Change-Id: Iac757cf9b47d2516804dca2efb347cfbd3282f14
diff --git a/src/backends/reference/RefLayerSupport.cpp b/src/backends/reference/RefLayerSupport.cpp
index 919c6db..f921383 100644
--- a/src/backends/reference/RefLayerSupport.cpp
+++ b/src/backends/reference/RefLayerSupport.cpp
@@ -1458,12 +1458,11 @@
     IgnoreUnused(output);
     bool supported = true;
 
-    std::array<DataType,4> supportedTypes =
+    std::array<DataType,3> supportedTypes =
     {
         DataType::BFloat16,
         DataType::Float32,
-        DataType::Float16,
-        DataType::Signed32
+        DataType::Float16
     };
 
     supported &= CheckSupportRule(TypeAnyOf(input, supportedTypes), reasonIfUnsupported,