Revert "nvmem: core: fix cleanup after dev_set_name()"

This reverts commit 23676ecd which is
commit 560181d3 upstream.

It breaks the Android kernel api, and isn't even really needed in the
5.10.y kernel tree yet, as there are no users of the new field.  So
revert it for now.  If it is needed, it can be brought back in an
abi-safe way in the future.

Bug: 161946584
Change-Id: Ie5f1017d74bcf014b0ba5fe2f9e91eed8b735af4
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>