java: cleanup build warnings

java: cleanup build warnings

Thss commit cleans up the following build warnings:
 - warning incompatible-pointer-types from JniCaInterface.c
 - warning missing-field-initializers from JniCaInterface.c
 - warning reorder from JniOcPresenceHandle.cpp
 - warning unused-variable from JniOcProvisioning.cpp
 - warning unused-but-set-variable JniSecureUtils.cpp

Change-Id: I80c0df6effdff4ea089a15b53f16588c14853077
Signed-off-by: George Nash <george.nash@intel.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/21433
Tested-by: jenkins-iotivity <jenkins@iotivity.org>
Reviewed-by: Larry Sachs <larry.j.sachs@intel.com>
Reviewed-by: Rick Bell <richard.s.bell@intel.com>
(cherry picked from commit e25cf3641d3cdff26054a06c95d7f6ad5ab35c54)
Reviewed-on: https://gerrit.iotivity.org/gerrit/21503