Added implementation for getDeviceId and setDeviceId

Added implementation for getDeviceId and setDeviceId

code formatted

Signed-off-by: Sunil Kumar K R <sunil.k14@samsung.com>
Change-Id: Ic0d640638bd0c1a258db6c21bbecbd73e2c6dd3f
Signed-off-by: Ashwini Kumar <k.ashwini@samsung.com>
Signed-off-by: Randeep Singh <randeep.s@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/10621
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: dongik Lee <dongik.lee@samsung.com>
Signed-off-by: Sunil Kumar K R <sunil.k14@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/12929