pld: add support for lattice ecp2 and ecp3 devices

Change-Id: I29c227c37be464f7ecc97a30d9cf3da1442e2b7f
Signed-off-by: Daniel Anselmi <danselmi@gmx.ch>
Reviewed-on: https://review.openocd.org/c/openocd/+/7396
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
Tested-by: jenkins

src/pld/pld.c

@@ -18,9 +18,11 @@
 
 /* pld drivers
  */
+extern struct pld_driver lattice_pld;
 extern struct pld_driver virtex2_pld;
 
 static struct pld_driver *pld_drivers[] = {
+	&lattice_pld,
 	&virtex2_pld,
 	NULL,
 };