drivers: entropy: stm32 rng driver configuration for NIST

The driver is writing the DTS nist-config to the RNG periph.
following the validation sequence described by the RefMan.
It depends on the he RNG IP version and is present on some
mcu devices : all with CONDRST bit.
Depends on the RNG CR Autoreset.
Takes the Health test control Register if property is given.

Signed-off-by: Francois Ramu <francois.ramu@st.com>