iio:imu:mpu6050: Modify matricies to matrices

The plural of "matrix" is "matrices".

Signed-off-by: Guoqing Chi <chiguoqing@yulong.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Jean-Baptiste Maneyrol <jmaneyrol@invensense.com>
Link: https://lore.kernel.org/r/20210322013024.1849-1-chi962464zy@163.com


Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>