The following liquibase changeset does not work as expected

```xml
        <createTable tableName="test">
            <column name="id" type="SERIAL">
                <constraints nullable="false" primaryKey="true"/>
            </column>
        </createTable>
```

This changeset results in sql

```sql
CREATE TABLE test (id INTEGER NOT NULL, CONSTRAINT TEST_PKEY PRIMARY KEY (id));
```

In liquibase 3.6.3 and earlier the type `SERIAL` was used for the column which means that a sequence is automatically included.

This issue seems to be caused by #874
It appears that SERIAL columns are replaced by INT, however liquibase does reconize that this column type is an auto increment column.

It would be acceptible if the generated sql would be

```sql
CREATE TABLE test (id INTEGER GENERATED BY DEFAULT AS IDENTITY NOT NULL, CONSTRAINT TEST_PKEY PRIMARY KEY (id));
```


* @param value the new value to add as parameter.
     */
    public void addParameter(Object value) {
        this.parameters.add(value);
    }
    /**
     * Returns additional information that was stored during {@link DataTypeFactory#fromDescription(String, Database)}
     * or other parsers.
     * @return the additional information. Might be null.
     */
    public String getAdditionalInformation() {
        return additionalInformation;
    }
    public void setAdditionalInformation(String additionalInformation) {
        this.additionalInformation = additionalInformation;
    }
    /**
     * Obtains the "raw" data type definition if one was used to create this object as a result of parsing
     * @return the raw definition, or null.
     */
    public String getRawDefinition() {
        return rawDefinition;
    }
    /**
     * Validates the correct state of this data type against a given database.
     * @param database the database to validate against
     * @return true if the current settings for this data type can be implemented on the given database, false otherwise
     */
    public boolean validate(Database database) {
        int maxParameters = this.getMaxParameters(database);