Move Callout/README.md

Place under xyz/openbmc_project/Common/Callout/.

Change-Id: I38161382d2e362b0849f0cc3ad58cc9ed463d4b7
Signed-off-by: Deepak Kodihalli <dkodihal@in.ibm.com>
diff --git a/xyz/openbmc_project/Error/Callout/README.md b/xyz/openbmc_project/Common/Callout/README.md
similarity index 100%
rename from xyz/openbmc_project/Error/Callout/README.md
rename to xyz/openbmc_project/Common/Callout/README.md