examples/sensorbd_demo: modify i2c mpu9250 test
examples/sensorbd_demo: modify i2c mpu9250 test

This is a patch for shortening the time when reading the 3-axis register
value of the MPU9250. Note that the axes are arranged next to each
other, and the values of the three axes can be read by one READ.

Change-Id: I9411c57ed02e9708f256332620c219edcf52f7d4
Signed-off-by: Junhwan Park <7fee488b6f78fc50b291ffc7d10428788977e877@samsung.com>

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