In [018dbcfd6679c273842084ce34c167295bc6f354](zephyrproject-rtos/zephyr@018dbcf),
Zephyr introduced the -Wdouble-promotion compiler flag.

We have some debugging logs that implicitly promote floats to double,
and it generates a lot of warnings. This commit fixes it.

This relic of the past was briefly used when I first wrote the
nrf-connect firmware and tested it against the nrf52840dk_nrf52840 dev
board.

It looks like ZBOSS's macro fiesta introduced a new argument in `ZB_ZCL_SET_ATTR_DESC_*` --  see [git blame](https://github.com/nrfconnect/sdk-nrfxlib/blame/11a7add841663509a20b51c0e208ad8091fe1132/zboss/production/include/zcl/zb_zcl_illuminance_measurement.h#L129)