mainboard/asus/f2a85-m: Disable IMC build option.

The A85 IMC is unused on this board, disable the build option.
The original ASUS BIOS image does not contain any IMC firmware.

Change-Id: I93fd50f2d4a85811ed43722e90f38864610f1cda
Signed-off-by: Tobias Diedrich <ranma+coreboot@tdiedrich.de>
Reviewed-on: http://review.coreboot.org/7385
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Rudolf Marek <r.marek@assembler.cz>
mainboard/asus/f2a85-m: Disable LEGACY_FREE setting

The ASUS F2A85-M has a keyboard controller, serial and parallel port
and thus is not legacy free at all.

Setting LEGACY_FREE causes some early bootup serial debug messages
to be lost.

Change-Id: Ibba38826e2f863c6e490e52bd5854e5dc0b6a357
Signed-off-by: Tobias Diedrich <ranma+coreboot@tdiedrich.de>
Reviewed-on: http://review.coreboot.org/7480
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins)
Reviewed-by: Rudolf Marek <r.marek@assembler.cz>