[qca-nss-ecm] Modification related to DSCP map API changes

The dscp to priority mapping APIs were changed in the NSS driver
to make it into a helper package (instead of a stand along special
interface). These are the resulting changes in ECM.

Change-Id: I90ecf0ad46fcedca224a222058b0a2d80a8152d8
Signed-off-by: Sakthi Vignesh Radhakrishnan <sradhakr@codeaurora.org>
2 files changed