FIX: fixed the following issues

1.Optimized the flight controller forced landing sample.
2.Fixed the exception log of duplicate subscription data on M300 RTK
payload port.
3.Fixed data subscription gimbal angle data definition error on M300 RTK
4.Fixed an issue where occasionally getting the camera aperture
parameter is zero.

Signed-off-by: DJI-Martin <DJI-Martin@dji.com>

samples/sample_c/platform/linux/manifold2/application/dji_sdk_config.h

@@ -62,6 +62,8 @@ extern "C" {
 
 #define CONFIG_MODULE_SAMPLE_UPGRADE_ON
 
+#define CONFIG_MODULE_SAMPLE_FC_SUBSCRIPTION_ON
+
 /*!< Attention: This function needs to be used together with mobile sdk mop sample.
 * */
 //#define CONFIG_MODULE_SAMPLE_MOP_CHANNEL_ON