phosphor-dbus-interfaces: Add PrettyName and Log fields for fault log interface patch

Ported from
https://gbmc-internal-review.git.corp.google.com/c/meta-google-gbmc/+/311969
to put in meta-gbmc-staging instead.

This patch adds the PrettyName and Log entries into the
phosphor-dbus-interfaces.

Google-Bug-Id: 548715074
Tested: https://paste.googleplex.com/4842358326820864
Fusion-Link: fusion2 n/a this is not tested by fusion
Change-Id: I01b7ab421355c0a51ce8065958fa5af3fdb01c4d
Signed-off-by: David Tang <davtang@google.com>