[][mtd: mtk-snand: set NFI_CNFG as default after finishing read_cache & program_load]

[Description]
Fix write error with setting NFI_CNFG as default after
finishing read_cache & program_load operations.

[Release-log]
N/A

Change-Id: Iead65bbe75a12b066cb01706b0a654ec83666b04
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/4551099
1 file changed