[][OpenWrt Dev][nmbm: remove unnecessary mark bad in read operation]

[Description]
Remove marking bad logic on read failure

The NAND device won't fail on reading (only timeout exists).

[Release-log]
N/A

Change-Id: I0debd3419610b34bf899bfb2c68805e17ca3b1ba
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/4649344
1 file changed