msm: ipa3: Flush Filtering and Routing cache on SSR event

As part of SSR logic, APPS cleans Q6 Filtering and Routing
tables so they point to empty tables.
At IPA3 connection cache is stored at IPA H/W so packets
may get rule hit at the cache and bypass the rules scan.
Flushing the cache is needed to ensure handling integrity.

CRs-Fixed: 1007738
Change-Id: I80e16f8cd449f6183810304bd92cc5f302125237
Signed-off-by: Ghanim Fodi <gfodi@codeaurora.org>