iio: bmi323: fix copy and paste bugs in suspend resume

iio: bmi323: fix copy and paste bugs in suspend resume

This code is using bmi323_reg_savestate[] and ->reg_settings[] instead
of bmi323_ext_reg_savestate[] and ->ext_reg_settings[].  This was
discovered by Smatch:

    drivers/iio/imu/bmi323/bmi323_core.c:2202 bmi323_core_runtime_suspend()
    error: buffer overflow 'bmi323_reg_savestate' 9 <= 11

Fixes: 16531118ba63 ("iio: bmi323: peripheral in lowest power state on suspend")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Link: https://patch.msgid.link/7175b8ec-85cf-4fbf-a4e1-c4c43c3b665c@stanley.mountain
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>