Device property memoryBusWidth implementation.

+ Device property memoryBusWidth is added to hipDeviceProp_t struct.
+ Device attribute hipDeviceAttributeMemoryBusWidth is added to hipDeviceAttribute_t struct.
+ Tests update.

tests/src/hipGetDeviceAttribute.cpp

@@ -68,6 +68,7 @@ int main(int argc, char *argv[])
     CHECK(test_hipDeviceGetAttribute(deviceId, hipDeviceAttributeMaxRegistersPerBlock, props.regsPerBlock));
     CHECK(test_hipDeviceGetAttribute(deviceId, hipDeviceAttributeClockRate, props.clockRate));
     CHECK(test_hipDeviceGetAttribute(deviceId, hipDeviceAttributeMemoryClockRate, props.memoryClockRate));
+    CHECK(test_hipDeviceGetAttribute(deviceId, hipDeviceAttributeMemoryBusWidth, props.memoryBusWidth));
     CHECK(test_hipDeviceGetAttribute(deviceId, hipDeviceAttributeMultiprocessorCount, props.multiProcessorCount));
     CHECK(test_hipDeviceGetAttribute(deviceId, hipDeviceAttributeComputeMode, props.computeMode));
     CHECK(test_hipDeviceGetAttribute(deviceId, hipDeviceAttributeL2CacheSize, props.l2CacheSize));