feat(stm32mp1): add "Boot mode" management for STM32MP13

Add new APIs to enter and exit "boot mode".

In this mode a potential tamper won't block access or reset
the secure IPs needed while boot, without this mode a dead
lock may occurs.

Change-Id: Iad60d4a0420ec125b842a285f73a20eb54cd1828
Signed-off-by: Nicolas Toromanoff <nicolas.toromanoff@st.com>
2 files changed