drivers: iio: mpu3050: use dev_err_probe for regulator request

drivers: iio: mpu3050: use dev_err_probe for regulator request

Regulator requesting may result in deferred probing error which will
abort driver probing. To avoid this just use dev_err_probe which handles
deferred probing.

Fixes: 3904b28efb2c ("iio: gyro: Add driver for the MPU-3050 gyroscope")
Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>