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On STMicroelectronics boards, the board information is stored in OTP.
This OTP is described in device tree, in BSEC board_id node.

Change-Id: Ieccbdcb048343680faac8dc577b75c67ac106f5b
Signed-off-by: Yann Gautier <yann.gautier@st.com>
Signed-off-by: Lionel Debieve <lionel.debieve@st.com>