ARM: dts: stm32: Add romem and temperature calibration on stm32mp157c

Add & enable stm32 factory-programmed memory. Describe temperature sensor
calibration cells. Non-volatile calibration data is made available by
stm32mp157c bootrom in bsec_dataX registers.

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>