Disable device side malloc (#2009)

* Disable device side malloc

Currently device side malloc is not working and takes excessive
device memory.

Disable it for now until a working malloc is implemented.

Change-Id: I1ad908c1c53a83752383b4be96688a848642c699

src/hip_device.cpp

@@ -96,12 +96,13 @@ hipError_t hipDeviceGetLimit(size_t* pValue, hipLimit_t limit) {
     if (pValue == nullptr) {
         return ihipLogStatus(hipErrorInvalidValue);
     }
+#if __HIP_ENABLE_DEVICE_MALLOC__
     if (limit == hipLimitMallocHeapSize) {
         *pValue = (size_t)__HIP_SIZE_OF_HEAP;
         return ihipLogStatus(hipSuccess);
-    } else {
-        return ihipLogStatus(hipErrorUnsupportedLimit);
     }
+#endif
+    return ihipLogStatus(hipErrorUnsupportedLimit);
 }
 
 hipError_t hipFuncSetCacheConfig(const void* func, hipFuncCache_t cacheConfig) {

src/hip_memory.cpp

@@ -19,6 +19,7 @@ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 */
+
 #include <hc_am.hpp>
 #include "hsa/hsa.h"
 #include "hsa/hsa_ext_amd.h"
@@ -30,8 +31,10 @@ THE SOFTWARE.
 #include <functional>
 #include <fstream>
 
+#if __HIP_ENABLE_DEVICE_MALLOC__
 __device__ char __hip_device_heap[__HIP_SIZE_OF_HEAP];
 __device__ uint32_t __hip_device_page_flag[__HIP_NUM_PAGES];
+#endif
 
 // Internal HIP APIS:
 namespace hip_internal {