board: update test on misc_read result in board_late_init
Update management of misc_read, which now return length of data after the commit 8729b1ae ("misc: Update read() and write() methods to return bytes xfered") Fixes: 8b8b3d6b ("stm32mp1: board: add environment variable for board id and board rev") Signed-off-by: NPatrick Delaunay <patrick.delaunay@st.com> Reviewed-by: NPatrice Chotard <patrice.chotard@st.com>
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