[Bug 209203] Suspend panics VESA driver

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209203

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A commit references this bug:

Author: royger
Date: Wed Jul 20 09:29:39 UTC 2016
New revision: 303076
URL: https://svnweb.freebsd.org/changeset/base/303076

Log:
  vesa: fix panic on suspend

  Fix the following panic seen when migrating a FreeBSD guest on Xen:

  panic: mtx_lock() of destroyed mutex @ /usr/src/sys/dev/fb/vesa.c:541
  cpuid = 0
  KDB: stack backtrace:
  db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame
0xfffffe001d2fa4f0
  vpanic() at vpanic+0x182/frame 0xfffffe001d2fa570
  kassert_panic() at kassert_panic+0x126/frame 0xfffffe001d2fa5e0
  __mtx_lock_flags() at __mtx_lock_flags+0x15b/frame 0xfffffe001d2fa630
  vesa_bios_save_restore() at vesa_bios_save_restore+0x78/frame
0xfffffe001d2fa680
  vga_suspend() at vga_suspend+0xa3/frame 0xfffffe001d2fa6b0
  isavga_suspend() at isavga_suspend+0x1d/frame 0xfffffe001d2fa6d0
  bus_generic_suspend_child() at bus_generic_suspend_child+0x44/frame
  [...]

  This is caused because vga_sub_configure (which is called if the VGA adapter
  is attached after VESA tried to initialize), points to vesa_configure, which
  doesn't initialize the VESA mutex. In order to fix it, make sure
  vga_sub_configure points to vesa_load, so that all the needed vesa
  components are properly initialized.

  Sponsored by:         Citrix Systems R&D
  MFC after:            3 days
  PR:                   209203
  Reviewed by:          dumbbell
  Differential revision:        https://reviews.freebsd.org/D7196

Changes:
  head/sys/dev/fb/vesa.c

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