[][nvmem: porting newest upstream source code 1/5]

[Description]
Add newest upstream source code on nvmem relations.

[Release-log]
N/A

Change-Id: I999e439f6706a00593c385e7adb5367c973d644b
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/5579214
5 files changed