msm: ipa3: Do not use APPS pipes for IPA kernel-test

IPA Endpoint 16 is the one assigned to APPS for WAN data.
This pipe is connected when modem is up. Kernel-tests
framework should not use it for testing purposes as this
pipe is already allocated for APPS. Update the code
to use another IPA Endpoint.

Change-Id: Ia0ed2ad9041353def1b3055d394281bca2893f88
CRs-fixed: 1034319
Signed-off-by: Ghanim Fodi <gfodi@codeaurora.org>