Tools: param files to ease SITL setup of GPS-for-yaw

Tools/autotest/default_params/copter-gps-for-yaw-nmea.parm

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+# SITL GPS-for-yaw using a single simulated NMEA GPS
+EK3_SRC1_YAW 2
+GPS_TYPE 5
+SIM_GPS_TYPE 5
+SIM_GPS_HDG 1

Tools/autotest/default_params/copter-gps-for-yaw.parm

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+# SITL GPS-for-yaw using two simulated UBlox GPSs
+EK3_SRC1_YAW 2
+GPS_AUTO_CONFIG 0
+GPS_TYPE 17
+GPS_TYPE2 18
+GPS_POS1_Y -0.2
+GPS_POS2_Y 0.2
+SIM_GPS_POS_Y -0.2
+SIM_GPS2_POS_Y 0.2
+SIM_GPS2_DISABLE 0
+SIM_GPS2_HDG 1