Split Navio2 specific parts from general RPI2 files

For Navio2, make posix_navio2_release and use navio2.config.

posix-configs/rpi2/mainapp.config

@@ -19,5 +19,3 @@ sleep 1
 mavlink stream -u 14556 -s HIGHRES_IMU -r 50
 mavlink stream -u 14556 -s ATTITUDE -r 50
 mavlink boot_complete
-rcinput start
-pwm_out start

posix-configs/rpi2/navio2.config

@@ -0,0 +1,24 @@
+uorb start
+param set SYS_AUTOSTART 4001
+param set MAV_BROADCAST 1
+sleep 1
+param set MAV_TYPE 2
+df_lsm9ds1_wrapper start -R 4
+#df_mpu9250_wrapper start -R 10
+#df_hmc5883_wrapper start
+df_ms5611_wrapper start
+gps start -d /dev/pts/0
+sensors start
+commander start
+attitude_estimator_q start
+position_estimator_inav start
+land_detector start multicopter
+mc_pos_control start
+mc_att_control start
+mavlink start -d /dev/ttyUSB0
+sleep 1
+mavlink stream -d /dev/ttyUSB0 -s HIGHRES_IMU -r 50
+mavlink stream -d /dev/ttyUSB0 -s ATTITUDE -r 50
+mavlink boot_complete
+navio_sysfs_rcinput start
+navio_sysfs_pwm_out start