imu: revert commit b62bbfc

This commit essentially reverts the changes made in b62bbfc.
That is, it removes some Accelerometer data sampling rates which
we don't support in the mode that we are using the Accelerometer

Signed-off-by: Dan O'Donovan <dan@emutex.com>

Author: Dan-Lightsource

libraries/CurieImu/src/BMI160.h

@@ -318,11 +318,7 @@ typedef enum {
  * @see setAccelRate()
  */
 typedef enum {
-    BMI160_ACCEL_RATE_25_32HZ = 1, /**<   25/32 Hz */
-    BMI160_ACCEL_RATE_25_16HZ,     /**<   25/16 Hz */
-    BMI160_ACCEL_RATE_25_8HZ,      /**<   25/8  Hz */
-    BMI160_ACCEL_RATE_25_4HZ,      /**<   25/4  Hz */
-    BMI160_ACCEL_RATE_25_2HZ,      /**<   25/2  Hz */
+    BMI160_ACCEL_RATE_25_2HZ = 5,  /**<   25/2  Hz */
     BMI160_ACCEL_RATE_25HZ,        /**<   25    Hz */
     BMI160_ACCEL_RATE_50HZ,        /**<   50    Hz */
     BMI160_ACCEL_RATE_100HZ,       /**<  100    Hz */