mbedtls: remove .git after prepared for tizen
mbedtls: remove .git after prepared for tizen

Change-Id: Ifff1cb0c043d3ea089bfef5e1568c57edfa86c89
Origin: https://gerrit.iotivity.org/gerrit/#/c/25835/
Signed-off-by: Philippe Coval <e55eb7f5ae8caa4c9c0d2fc7cb5c13ca6c4cd6e0@samsung.com>
(cherry picked from commit 5ae3ade733f273da06c86b0260d67dadec06703f)

iotivity/iotivity,iotivity/iotivity,rzr/iotivity,rzr/iotivity,rzr/iotivity,iotivity/iotivity,rzr/iotivity,iotivity/iotivity,iotivity/iotivity,rzr/iotivity,iotivity/iotivity,iotivity/iotivity,iotivity/iotivity,rzr/iotivity,rzr/iotivity