Update git submodules

* Update docs/submodules/barometer from branch 'master'
  - Merge "docs: update userguide with new option for intel_pmu plugin"
  - docs: update userguide with new option for intel_pmu plugin

    Update the userguide for intel_pmu with new "Cores"
    option available in plugin configuration.
    Added sample config with default configuration.

    Change-Id: Ibe4d451131dc2c9ae0282f018c7e23596f4bf2c1
    Signed-off-by: Kamil Wiatrowski <kamilx.wiatrowski@intel.com>

diff --git a/docs/submodules/barometer b/docs/submodules/barometer
index 7131726..7fd9d03 160000 (submodule)
--- a/docs/submodules/barometer
+++ b/docs/submodules/barometer
@@ -1 +1 @@
-Subproject commit 713172689288535176369335fad0b008c43e590c
+Subproject commit 7fd9d03a8fbd3f4d51f353a985e56938316de4b1