The publication period is defined by Steps and Resolution.
At BLE Mesh protocol level, the period is encoded in a byte
where first LSB 6 bits correspond to PerSteps and the last
two to PerRes. There is an issue on how the code at
`subsys/bluetooth/mesh/shell/cfg.c:model_pub_set` is encoding
these two values into the publication period byte.
This is commit fixes issue #87780
Signed-off-by: Raúl Gotor <raulgotor@gmail.com>
39c0c4f43c