kbd: add brazil kbd keys to qemu

The brazilian computer keyboard layout has two extra keys (compared to
the usual 105-key intl ps/2 keyboard).  This patch makes these two keys
known to qemu.

For historic reasons qemu has two ways to specify a key:  A QKeyCode
(name-based) or a number (ps/2 scancode based).  Therefore we have to
update multiple places to make new keys known to qemu:

  (1) The QKeyCode definition in qapi-schema.json
  (2) The QKeyCode <-> number mapping table in ui/input-keymap.c

This patch does just that.  With this patch applied you can send those
two keys to the guest using the send-key monitor command.

Cc: qemu-stable@nongnu.org
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Daniel P. Berrange <berrange@redhat.com>
Reviewed-by: Michael Tokarev <mjt@tls.msk.ru>