update seabios submodule to release 1.8.2

git shortlog rel-1.8.1..rel-1.8.2
=================================

Gerd Hoffmann (1):
      vga: rework virtio-vga support

Kevin O'Connor (5):
      vgabios: Add config option for assembler fixups
      vgabios: Emulate "leal" instruction
      build: Support "make VERSION=xyz" to override the default build version
      build: CONFIG_VGA_FIXUP_ASM should depend on CONFIG_BUILD_VGABIOS
      vgabios: On bda_save_restore() the saved vbe_mode also has flags in it

Paolo Bonzini (1):
      smm: ignore bits 16,18-31 of SMM revision ID

Vladimir Serbinenko (1):
      ahci: Ignore max_ports.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
