feat: define common max_vel (autowarefoundation#870)

Signed-off-by: Takayuki Murooka <takayuki5168@gmail.com>

Author: takayuki5168

autoware_launch/config/planning/scenario_planning/common/common.param.yaml

@@ -1,5 +1,7 @@
 /**:
   ros__parameters:
+    max_vel: 11.1           # max velocity limit [m/s]
+
     # constraints param for normal driving
     normal:
       min_acc: -1.0         # min deceleration [m/ss]

autoware_launch/config/planning/scenario_planning/common/motion_velocity_smoother/motion_velocity_smoother.param.yaml

@@ -1,7 +1,6 @@
 /**:
   ros__parameters:
     # motion state constraints
-    max_velocity: 20.0      # max velocity limit [m/s]
     stop_decel: 0.0         # deceleration at a stop point[m/ss]
 
     # external velocity limit parameter