nfsd: Fix initialization broken by 7344856e3a6d

Oops, although the vneting macros do not do anything yet,
commit 7344856e3a6d did change where things are initialized
and one of the initialization functions was not being called
early enough. This patch moves nfsrvd_init(0) to the
function called via (VNET_)SYSINIT() to fix this.

(cherry picked from commit fcfdb76e12fb3cdf584e6f06e56e7c48ec475cc6)