prjxray: Add INOUT to direction enum.

INOUT is found on the PS7 interface on the Zynq.

Signed-off-by: Tim 'mithro' Ansell <me@mith.ro>

prjxray/site_type.py

@@ -7,6 +7,7 @@ import enum
 class SitePinDirection(enum.Enum):
     IN = "IN"
     OUT = "OUT"
+    INOUT = "INOUT"
 
 
 SiteTypePin = namedtuple('SiteTypePin', 'name direction')