samples: mesh: boards: nrf52: upgrade to pass PTS test

Updated state Binding as per PTS test requirements. Now if
gen_onoff_server & gen_onpowerup_server received Prohibited values
then they will not react on it further. Plus make necessary changes
wherever required for message handlers as per Mesh Model
Specification which is mostly regarding to default & range values.
Now right Status code would get publish in response to set lightness
& temperature range. Also upgrade Message handler
gen_delta_set_unack() algorithm as per PTS requirements.

Signed-off-by: Vikrant More <vikrant8051@gmail.com>