Add Header files on spec file for developing programs using iotivity on tizen

Add Header files on spec file for developing programs using iotivity on tizen

Change-Id: I7a634660b3a60808046c19cbc7519612087e9068
Signed-off-by: youngman <yman.jung@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/672
Reviewed-by: Minchul Lee <slotus.lee@samsung.com>
Reviewed-by: saerome kim <saerome.kim@samsung.com>
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Caiwen Zhang <caiwen.zhang@intel.com>
Reviewed-by: Ashok Babu Channa <ashok.channa@samsung.com>
Reviewed-by: Uze Choi <uzchoi@samsung.com>