Documentation/mainboard: Add QEMU POWER9 to index site

The QEMU POWER9 target is supported since coreboot version 4.15.
Documentation is available in the tree, but it's not referenced from
the mainboard index page. Fix that.

Change-Id: Ic3b98735840c146cb0bfb122df0e6f762c2beeca
Signed-off-by: Felix Singer <felixsinger@posteo.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/62451
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

0 files changed, 0 insertions, 0 deletions