pbdrv/imu: Fix error include.
This is needed whether the IMU is enabled or not.
#define PBDRV_IMU_H
#include <pbdrv/config.h>
+#include <pbio/error.h>
/**
* Opaque handle to an IMU device instance.
@@ -18,8 +19,6 @@ typedef struct _pbdrv_imu_dev_t pbdrv_imu_dev_t;
#if PBDRV_CONFIG_IMU
-#include <pbio/error.h>
-
/**
* Gets the one and only IMU device instance.
* @param [out] imu_dev The device instance.
