Add RIT and XIT for Flex 6xxx

rigs/kenwood/flex6xxx.c

@@ -1109,8 +1109,8 @@ const struct rig_caps f6k_caps =
     .post_write_delay = 20,
     .preamp =       { RIG_DBLST_END, },
     .attenuator =       { RIG_DBLST_END, },
-    .max_rit =      Hz(0),
-    .max_xit =      Hz(0),
+    .max_rit =      Hz(99999),
+    .max_xit =      Hz(99999),
     .max_ifshift =      Hz(0),
     .vfo_ops =      RIG_OP_NONE,
     .targetable_vfo =   RIG_TARGETABLE_FREQ | RIG_TARGETABLE_MODE,
@@ -1182,6 +1182,10 @@ const struct rig_caps f6k_caps =
     .rig_close =        kenwood_close,
     .set_freq =     kenwood_set_freq,
     .get_freq =     kenwood_get_freq,
+    .set_rit =  kenwood_set_rit,
+    .get_rit =  kenwood_get_rit,
+    .set_xit =  kenwood_set_xit,
+    .get_xit =  kenwood_get_xit,
     .set_mode =     flex6k_set_mode,
     .get_mode =     flex6k_get_mode,
     .set_vfo =      kenwood_set_vfo,