Update git submodules

* Update docs/submodules/barometer from branch 'master'
  - Merge "src: update to use collectd 5.8.0"
  - src: update to use collectd 5.8.0

    Update the src build to use collectd 5.8.0 instead of master. Update the PMU
    build to ensure it download all event files.

    Change-Id: Ib71ee6fc0ed7960368ce1b93fc9ca9bfbb16ba05
    Signed-off-by: Maryam Tahhan <maryam.tahhan@intel.com>

diff --git a/docs/submodules/barometer b/docs/submodules/barometer
index 5a5770d..435e73e 160000 (submodule)
--- a/docs/submodules/barometer
+++ b/docs/submodules/barometer
@@ -1 +1 @@
-Subproject commit 5a5770d65cfd70700c4251be96e8804bdb36d322
+Subproject commit 435e73e5550c92be75e4fde8bafbed54ea818437