MPU9K: Use shorter perf names

src/drivers/mpu9250/mpu9250.cpp

@@ -234,14 +234,14 @@ MPU9250::MPU9250(int bus, const char *path_accel, const char *path_gyro, const c
 	_gyro_range_rad_s(0.0f),
 	_dlpf_freq(MPU9250_DEFAULT_ONCHIP_FILTER_FREQ),
 	_sample_rate(1000),
-	_accel_reads(perf_alloc(PC_COUNT, "mpu9250_accel_read")),
+	_accel_reads(perf_alloc(PC_COUNT, "mpu9250_acc_read")),
 	_gyro_reads(perf_alloc(PC_COUNT, "mpu9250_gyro_read")),
 	_sample_perf(perf_alloc(PC_ELAPSED, "mpu9250_read")),
-	_bad_transfers(perf_alloc(PC_COUNT, "mpu9250_bad_transfers")),
-	_bad_registers(perf_alloc(PC_COUNT, "mpu9250_bad_registers")),
-	_good_transfers(perf_alloc(PC_COUNT, "mpu9250_good_transfers")),
-	_reset_retries(perf_alloc(PC_COUNT, "mpu9250_reset_retries")),
-	_duplicates(perf_alloc(PC_COUNT, "mpu9250_duplicates")),
+	_bad_transfers(perf_alloc(PC_COUNT, "mpu9250_bad_trans")),
+	_bad_registers(perf_alloc(PC_COUNT, "mpu9250_bad_reg")),
+	_good_transfers(perf_alloc(PC_COUNT, "mpu9250_good_trans")),
+	_reset_retries(perf_alloc(PC_COUNT, "mpu9250_reset")),
+	_duplicates(perf_alloc(PC_COUNT, "mpu9250_dupe")),
 	_controller_latency_perf(perf_alloc_once(PC_ELAPSED, "ctrl_latency")),
 	_register_wait(0),
 	_reset_wait(0),