[IOT-2594] Add 'throws' to native api declaration

[IOT-2594] Add 'throws' to native api declaration

getLinkedDevices() native api declaration in OcSecureResource.java
requires a throws clause in order to catch a possible exception
from the jni implementation layer.

Change-Id: Ic1e02b0d0f2980c1fd10d59ed48575ea2d7e6734
Signed-off-by: Larry Sachs <larry.j.sachs@intel.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/21839
Tested-by: jenkins-iotivity <jenkins@iotivity.org>
Reviewed-by: George Nash <george.nash@intel.com>
Reviewed-by: Rick Bell <richard.s.bell@intel.com>