[CONPRO-311] Fix due to TinyCBOR v0.4 Release

[CONPRO-311] Fix due to TinyCBOR v0.4 Release

The anonymous union member of struct CborEncoder is no longer anonymous.
References to the union member are replaced by API added for them

Patch #1: Initial upload

Change-Id: Ie47779bee68cfae4fa578ae39ae087ea23b905df
Signed-off-by: Jongmin Choi <jminl.choi@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/14179
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Jongsung Lee <js126.lee@samsung.com>
Reviewed-by: Randeep Singh <randeep.s@samsung.com>
(cherry picked from commit 9a31ef80095f6382985404ba0a6c71437c9d8c43)
Reviewed-on: https://gerrit.iotivity.org/gerrit/14203