board: stm32mp1: read OTP in command stboard

Read the value directly from the OTP and no more of the shadows
to avoid the need of reboot after stboard command to have correct value.

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Acked-by: Patrice Chotard <patrice.chotard@st.com>
1 file changed