board: stm32mp1: use const for struct node_info

Use const for the variable nodes in ft_board_setup,
this patch follow fdt_fixup_mtdparts prototype and no more use stack.

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