RDKCOM-2897: RDKBDEV-933: drop unnecessary buffer zeroing
RDKCOM-2897: RDKBDEV-933: drop unnecessary buffer zeroing

Reason for change:
drop unnecessary buffer zeroing in SETS_INTO_UTOPIA etc
macros in cosa_dhcpv6_apis.c
Test Procedure: Sanity.
Risks: None.
Signed-off-by: Andre McCurdy <armccurdy@gmail.com>

(cherry picked from commit 68017871ef4b1cd11e4a44c239c951863d1aba5c)
Change-Id: I5ce2d9a596a4c200acb16b345d6c4f2906a3ab00

rdkcmf/rdkb-CcspPandM,rdkcmf/rdkb-CcspPandM,rdkcmf/rdkb-CcspPandM