Update git submodules

* Update docs/submodules/barometer from branch 'master'
  - Merge "makefile: update collectd Makefile with intel_pmu configuration"
  - makefile: update collectd Makefile with intel_pmu configuration

    Update Makefile with intel_pmu collectd plugin required
    capabilities and environment variables set.

    Change-Id: Ifd9f53f4f87ea802ff280a611831f1dc8e2fb177
    Signed-off-by: Roman Korynkevych <romanx.korynkevych@intel.com>

diff --git a/docs/submodules/barometer b/docs/submodules/barometer
index 5133d0b..ac6f78b 160000 (submodule)
--- a/docs/submodules/barometer
+++ b/docs/submodules/barometer
@@ -1 +1 @@
-Subproject commit 5133d0b42c2923f22f94934169843d6fe2e3ded4
+Subproject commit ac6f78b6c88ed8975f6555fd85492ec59d3278d0