Roll src/third_party/cros_system_api/ 63c9de2bf..bbd71acf5 (3 commits)

https://chromium.googlesource.com/chromiumos/platform2/system_api.git/+log/63c9de2bf41a..bbd71acf57db

$ git log 63c9de2bf..bbd71acf5 --date=short --no-merges --format='%ad %ae %s'
2020-08-06 stevenjb shill: add kErrorDisconnect for dropped wifi connections
2020-08-14 alanding system_api: Add "ignore_dev_conf" field to StartArcVmRequest
2020-07-06 cujomalainey system_api: remove mic position constant

Created with:
  roll-dep src/third_party/cros_system_api

Bug: b:159953121
Change-Id: I030dcd3e029893a4da8cffdb9dbead635cd155bd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2361285Reviewed-by: Yusuke Sato <yusukes@chromium.org>
Reviewed-by: Aga Wronska <agawronska@chromium.org>
Commit-Queue: Alan Ding <alanding@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799252}

DEPS

@@ -890,7 +890,7 @@ deps = {
 
   # For Linux and Chromium OS.
   'src/third_party/cros_system_api': {
-      'url': Var('chromium_git') + '/chromiumos/platform2/system_api.git' + '@' + '63c9de2bf41a7221139de845687e5f2bf8364d05',
+      'url': Var('chromium_git') + '/chromiumos/platform2/system_api.git' + '@' + 'bbd71acf57db11ae096f69a44a3da6b1003a348f',
       'condition': 'checkout_linux',
   },