Follow up to r225617. In order to maximize the re-usability of kernel code
in userland rename in-kernel getenv()/setenv() to kern_setenv()/kern_getenv().
This fixes a namespace collision with libc symbols.

Submitted by:   kmacy
Tested by:      make universe
Correct two typos

PR:		194350
Submitted by:	jiashiun@gmail.com
Approved by:	hrs (mentor)
Update vt(4) for UEFI defaults and special keys

vt(4) is the default console for UEFI boot [1], and the bitmapped
kern.vt.spclkeys sysctl has been replaced with individual kern.vt.kbd_*
enable sysctls.

PR:		193710
Submitted by:	wblock [1]
Reviewed by:	wblock
MFC after:	3 days
Relnotes:	Yes
Sponsored by:	The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D953
fwsectors and fwheads used to be somehwat arbitrary. However, they are
used to align partitions in gpart. We also try to align partitions by
stripe size when creating new media. Align these two concepts by
making fwsectors the same as the stripe size. Select a sensible number
of heads so we wind up with about 20 cylinders. This number was
selected to keep the rounding effects to a few percent while keeping
the number of cylinder groups low.

Sadly, it is not possible to make these numbers match the numbers used
by SD card readers. There apperas to be much variation between brands
so there's no one universal number. These numbers are also not aligned
to the stripe size, so some performance problems may still be present
when SD cards are created this way.

Also, these numbers will differ from the far less common SD to ATA
adapters, which present a different, but more uniform, set of numbers
that also happened to match the old defaults.

Nothing should change for current users. Any suboptimal performance
caused by misalignment will still be there. gpart will honor the
partitions that aren't on proper boudnaries, but editing the partition
tables may result in different alignments being used than before when
editing things natively.

Ideally, there'd be some way to override these values in the disk
subsystem by the user for the USB adapter use case where all "native"
notions of geometry disappear. This does not implement that.
Add the Dresden Elektronik deRFnode device to uftdi(4).

MFC after:	1 week
There's no need to override the clean target. The clean target works
correctly without doing so.
Add 4k quirks for PM853T Samsung SSD

MFC after:	2 weeks
Sponsored by:	Limelight Networks
Don't define rules based on PROGS if PROGS is empty.

Reviewed by:	sjg, ngie
MFC after:	1 week
Sponsored by:	EMC / Isilon Storage Division
Merge remote-tracking branch 'freebsd/master' into hardened/current/master
Merge remote-tracking branch 'origin/hardened/current/master' into hardened/current/segvguard