Add bare-metal TDK IMU ESKF fusion

soc/software/gps_system/header/linked_list.h

@@ -17,6 +17,7 @@ typedef struct gps_ephem_ll {
 	volatile uint32_t gps_nav_solve_consumed_sequence;
 	volatile uint32_t gps_last_nav_solve_abs_sample;
 	volatile double gps_last_nav_solve_corrected_abs_sample;
+	volatile uint64_t gps_last_nav_solve_local_ticks;
 	volatile uint64_t gps_last_nav_solve_pps_counter;
 	volatile uint32_t gps_last_pps_capture_sequence;
 	volatile uint64_t gps_last_measurement_tick;