mtd: nand: mtk: remove unneeded mtk_ecc_hw_init from mtk_ecc_resume

There is no need to add mtk_ecc_hw_init during ecc resume, because there
always takes mtk_ecc_wait_idle in the function mtk_ecc_enable.

Signed-off-by: Xiaolei Li <xiaolei.li@mediatek.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>