Update FT5000 caps with agc levels

rigs/yaesu/ft5000.c

@@ -177,6 +177,8 @@ const struct rig_caps ftdx5000_caps =
     .max_rit =            Hz(9999),
     .max_xit =            Hz(9999),
     .max_ifshift =        Hz(1000),
+    .agc_level_count =    5,
+    .agc_levels =         { RIG_AGC_OFF, RIG_AGC_FAST, RIG_AGC_MEDIUM, RIG_AGC_SLOW, RIG_AGC_AUTO },
     .vfo_ops =            FTDX5000_VFO_OPS,
     .targetable_vfo =     RIG_TARGETABLE_FREQ | RIG_TARGETABLE_MODE | RIG_TARGETABLE_FUNC | RIG_TARGETABLE_LEVEL | RIG_TARGETABLE_ANT | RIG_TARGETABLE_ROOFING,
     .transceive =         RIG_TRN_OFF,        /* May enable later as the 5000 has an Auto Info command */