dt-bindings: mtd: ingenic: Use standard ecc-engine property

The 'ingenic,bch-controller' property is now deprecated and the
'ecc-engine' property should be used instead.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>