msm: ipa3: update ep mapping

Adopt recent changes from architecture document for
IPA endpoint mapping.

Change-Id: Ica64a25f0d20b27e7f0f904f0ed7415f315761fe
Acked-by: Ady Abraham <adya@qti.qualcomm.com>
Signed-off-by: Skylar Chang <chiaweic@codeaurora.org>