Export a function from sch_api.c that will look up desired qdisc and call it's registered change function to enable/disable flow. Change-Id: I5b6dc7a6fd2b09b796c92b3770ba83423d19c864 CRs-Fixed: 355156 Acked-by: Jimi Shah <jimis@qualcomm.com> Signed-off-by: Tianyi Gou <tgou@codeaurora.org> (cherry picked from commit b8419fe690053b76658d49565c57ac654faf2eaa) (cherry picked from commit 3a30e7aa4487f56a74f12c12f11cece6ce1f2100)