board: ti: fdt_ops: make ti_set_fdt_env() const-correct
Make the fdt_map parameter a pointer to const, since the function only
reads the mapping table. This improves API correctness and allows maps
to live in read-only data.
No functional change intended
Signed-off-by: Bhimeswararao Matsa <bhimeswararao.matsa@gmail.com>
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