AP_Compass: Add support to AK09915

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

libraries/AP_Compass/AP_Compass_AK09916.cpp

@@ -49,6 +49,7 @@ extern const AP_HAL::HAL &hal;
 
 #define ICM_WHOAMI_VAL      0xEA
 
+#define AK09915_Device_ID   0x10
 #define AK09916_Device_ID   0x09
 #define AK09918_Device_ID   0x0c
 #define AK09916_MILLIGAUSS_SCALE 10.0f
@@ -314,6 +315,9 @@ bool AP_Compass_AK09916::_check_id()
         /* Read AK09916's id */
         if (_bus->register_read(REG_DEVICE_ID, &deviceid)) {
             switch (deviceid) {
+            case AK09915_Device_ID:
+                _devtype = DEVTYPE_AK09915;
+                return true;
             case AK09916_Device_ID:
                 _devtype = DEVTYPE_AK09916;
                 return true;

libraries/AP_Compass/AP_Compass_Backend.h

@@ -66,6 +66,7 @@ public:
         DEVTYPE_RM3100_2 = 0x12, // unused, past mistake
         DEVTYPE_MMC5983 = 0x13,
         DEVTYPE_AK09918 = 0x14,
+        DEVTYPE_AK09915 = 0x15,
     };
 
 #if HAL_MSP_COMPASS_ENABLED