FreeBSD_HEAD_i386 - Build #2248 - Fixed

FreeBSD_HEAD_i386 - Build #2248 - Fixed:

Build information: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_i386/2248/
Full change log: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_i386/2248/changes
Full build log: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_i386/2248/console

Change summaries:

295076 by ngie:
Revert r295062 to unbreak buildworld

Some of the structures referenced in power.c (in particular
struct nvme_power_state) are missing from sbin/nvmecontrol/

Pointyhat to: imp
Reported by: Jenkins [*], O. Hartmann <ohartman_at_zedat.fu-berlin.de>, Outback Dingo <outbackdingo_at_gmail.com>

295075 by tuexen:
Update the path mtu when turning on/off UDP encapsulation for SCTP.

MFC after: 3 days

295074 by allanjude:
The zfsboot automated part of bsdinstall now supports UEFI

MFC after:	3 days
Sponsored by:	ScaleEngine Inc.
Differential Revision:	https://reviews.freebsd.org/D4960