asus/f2a85-m_le: Activate IOMMU support

Activate the IOMMU for the ASUS F2A85-M LE board.

Enable the IOMMU in `devicetree.cb` and build AGESA IOMMU code by
enabling the option in `buildOpts.c`.

ACPI and MPTABLES interrupt routers are already present since they are
syminks to the F2A85-M version.

```
$ uname -a
Linux nukunuku 4.8.5 #35 SMP Sun Oct 30 19:34:55 CET 2016 x86_64 GNU/Linux
$ lspci -s 0.2
00:00.2 IOMMU: Advanced Micro Devices, Inc. [AMD] Family 15h (Models 10h-1fh) I/O Memory Management Unit
$ dmesg | grep -i IOMMU
ACPI: IVRS 0x00000000BFFAFF70 000070 (v02 AMD    AMDIOMMU 00000001 AMD  00000000)
AMD-Vi: Applying erratum 746 workaround for IOMMU at 0000:00:00.2
iommu: Adding device 0000:00:01.0 to group 0
[...]
iommu: Adding device 0000:00:18.5 to group 9
iommu: Adding device 0000:03:00.0 to group 8
AMD-Vi: Found IOMMU at 0000:00:00.2 cap 0x40
AMD IOMMUv2 driver by Joerg Roedel <jroedel@suse.de>
```

Change-Id: I6049fcfad53d16a99495d7a8fbc584c71e371d73
Signed-off-by: Tobias Diedrich <ranma+coreboot@tdiedrich.de>
Reviewed-on: https://review.coreboot.org/18259
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Martin Roth <martinroth@google.com>

0 files changed, 0 insertions, 0 deletions