Restore rootca.crt in provisioning sample

Restore rootca.crt in provisioning sample

Revert https://gerrit.iotivity.org/gerrit/#/c/15451/
and restore rootca.crt in provisioning sample
due to Tizen gbsbuild error

Patch #1: Initial upload

Change-Id: I4691a7bbce822a1cd342c9aa874d3fb8a0fa0a29
Signed-off-by: Jongmin Choi <jminl.choi@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/15689
Reviewed-by: Jongsung Lee <js126.lee@samsung.com>
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Randeep Singh <randeep.s@samsung.com>
(cherry picked from commit c0645c683cf5f2978824b177f9f58bcb790a8462)
Reviewed-on: https://gerrit.iotivity.org/gerrit/16097