of14: remove of1.2/1.3 old SetField aciton API
of14: remove of1.2/1.3 old SetField aciton API

No reason to support the old awkward API for shiny OF1.4.

Signed-off-by: FUJITA Tomonori <93dac1fe9c4b2a3957982200319981492ad4976e@lab.ntt.co.jp>
Reviewed-by: Simon Horman <a105fd58f578dea0be108941d4c59d15396e1855@verge.net.au>

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