Merge DriverClassNameProvider in DatabaseDriver

DriverClassNameProvider is unused but was probably restored by a merge
commit at some point. It wasn't obvious and updated that class rather
than `DatabaseDriver`.

This commit updates `DatabaseDriver` and deletes
`DriverClassNameProvider`.

Closes gh-5076

Author: snicoll

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/jdbc/DatabaseDriver.java

@@ -90,6 +90,12 @@ enum DatabaseDriver {
 	SQLSERVER("com.microsoft.sqlserver.jdbc.SQLServerDriver",
 			"com.microsoft.sqlserver.jdbc.SQLServerXADataSource"),
 
+	/**
+	 * Firebird.
+	 */
+	FIREBIRD("org.firebirdsql.jdbc.FBDriver",
+			"org.firebirdsql.pool.FBConnectionPoolDataSource"),
+
 	/**
 	 * DB2 Server.
 	 */
@@ -99,7 +105,12 @@ enum DatabaseDriver {
 	 * DB2 AS400 Server.
 	 */
 	AS400("com.ibm.as400.access.AS400JDBCDriver",
-			"com.ibm.as400.access.AS400JDBCXADataSource");
+			"com.ibm.as400.access.AS400JDBCXADataSource"),
+
+	/**
+	 * Teradata.
+	 */
+	TERADATA("com.teradata.jdbc.TeraDriver");
 
 	private final String driverClassName;