SWDEV-399623 - [ABI Break] Remove 'memoryType' from hipPointerAttribute_t""

This reverts commit 8ed05a1567.

Reason for revert: Bringing back original change

Change-Id: I33bbc9b698e07ca8e03ee6b15bcb66f5795bbe4e

include/hip/hip_runtime_api.h

@@ -258,11 +258,7 @@ typedef enum hipMemoryType {
  * Pointer attributes
  */
 typedef struct hipPointerAttribute_t {
-  union {
-      // Deprecated, use instead type
-      enum hipMemoryType memoryType;
-      enum hipMemoryType type;
-    };
+    enum hipMemoryType type;
     int device;
     void* devicePointer;
     void* hostPointer;