iio: pressure: bmp280: Add identifier names in function definitions

checkpatch.pl complained about missing identifier names in the input
variables for some function definitions.

Signed-off-by: Vasileios Amoiridis <vassilisamir@gmail.com>
Link: https://lore.kernel.org/r/20240429190046.24252-4-vassilisamir@gmail.com


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