MFC UEFI memstick build script

r264935 (gjb):

    Add a separate script to build the memstick.img and the
    mini-memstick.img with UEFI support.

    As the comments in the file suggest, 1) there must
    be existing ${.OBJDIR}/usr/src/release/{release,bootonly};
    2) TARGET/TARGET_ARCH must be amd64; and 3) it must be
    a vt(4)-enabled kernel with vt_efifb (*not* vt_vga).

    This script is not hooked into release/Makefile in any way
    until further testing is complete.

r264992 (nwhitehorn):

    Make a dual-boot BIOS/UEFI memstick image. Testing required before
    this gets renamed make-memstick.sh.

r265017 (nwhitehorn):

    loader's GPT support on BIOS does not seem to like the root
    filesystem being the last filesystem on the disk for some reason
    when made by this script. Add a vestigial swap partition to allow
    this to boot with QEMU BIOS.

Approved by:	re
Sponsored by:	The FreeBSD Foundation
Document SA-14:18.

Approved by:	re (implicit)
Sponsored by:	The FreeBSD Foundation
MFC r270862, r270878: MMU fixes for kernel startup.

  Fix the handling of MMU type in the AP entry code.  The ARM_MMU_V6/V7
  symbols are always #defined to 0 or 1, so use #if SYM not #if defined(SYM).
  Also, it helps if you include the header file that defines the symbols.

  The Marvell PJ4B cpu family is armv7, not armv6.

Approved by:	re(gjb)
MFC r270858, 270879:

  Remove duplicated option FDT from individual Wandboard configs, leave
  the one in the common IMX6 file that they all include.

Approved by:	re(gjb)
MFC r270065:

  Move the imx6 sysctl temperature info to hw.imx6 where all the other
  soc-wide info lives.  It was under dev.imx6_anatop.0.

Approved by:	re(gjb)
MFC improved vt(4) font generation

r266851: Add VGAROM 8x8, 8x14 and 8x16 fonts for vt(4)

  These are converted from syscons(4) cp437 fonts.

r267306: Add vgarom font source

  These are in 'GNU Unifont' format, and are converted from syscons(4)
  cp437 fonts.

r267400: Add thin versions of VGAROM 8x8 and 8x16 fonts for vt(4)

  These are converted from syscons(4) cp437-thin-8x* fonts.

r267423: Build vt(4) fonts during buildworld

  vtfontcvt(8) is now built during buildworld, so can be used as a
  bootstrap tool to create vt(4) fonts from source .hex or .bdf font
  files, rather than having uuencoded binary fonts in the tree.

r267578: Add glyphs from converted syscons iso* fonts

  This consists of the unique glyphs from the following font files in
  /usr/share/syscons/fonts:

  iso*.fnt     ISO-8859-1 West European
  iso02*.fnt   ISO-8859-2 Central European
  iso04*.fnt   ISO-8859-4 Baltic
  iso05*.fnt   ISO-8859-5 Cyrillic
  iso07*.fnt   ISO-8859-7 Greek
  iso08*.fnt   ISO-8859-8 Hebrew
  iso09*.fnt   ISO-8859-9 Turkish
  iso15*.fnt   ISO-8859-15 West European

r268022: Rename the WITHOUT_VT_SUPPORT knob to WITHOUT_VT

  The _SUPPORT knobs have a consistent meaning which differs from the
  behaviour controlled by this knob.  As the knob is opt-out and has not
  appeared in a release the impact should be low.

Approved by:	re
Sponsored by:	The FreeBSD Foundation
Connect the UEFI-capable memstick.img to the build.

This is a direct commit to stable/10, as the script
in head/ does UEFI by default.

Approved by:	re (rodrigc)
Sponsored by:	The FreeBSD Foundation