iio: pressure: bmp280: Fix regmap for BMP280 device

Up to now, the BMP280 device is using the regmap of the BME280 which
has registers that exist only in the BME280 device.

Fixes: 14e8015f ("iio: pressure: bmp280: split driver in logical parts")
Signed-off-by: Vasileios Amoiridis <vassilisamir@gmail.com>
Link: https://patch.msgid.link/20240711211558.106327-2-vassilisamir@gmail.com


Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>