Fixing CA android sample application and ndk build

Fixing CA android sample application and ndk build

While resolving merge conflicts, header file is missed.
This is necessary to build the sample application.
Added necessary changes to build androd ndk as well

Change-Id: I0e2185abb5c82042bf7273ef61022e448b32468d
Signed-off-by: jnashok <jn.ashok@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/962
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: jihwan seo <jihwan.seo@samsung.com>
Reviewed-by: Erich Keane <erich.keane@intel.com>