msm: ipa: fix v6 rule index issue

Fix the issue of sending incorrect IPAv6 rule index of embedded
pipe to Q6. This change is needed for WWAN data path operation.

Change-Id: I8db93814b85c64e219110a2a40f88298d0c902f4
Signed-off-by: Ravi Gummadidala <rgummadi@codeaurora.org>