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Update management of misc_read, which now return length of data
after the commit 8729b1ae2cbd ("misc: Update read() and write()
methods to return bytes xfered")
Fixes: 8b8b3d6b55b9 ("stm32mp1: board: add environment variable for board id and board rev")
Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@st.com>