msm: ipa3: disable TX prefetch to support MBIM

In order to enable MBIM aggregation TX prefetch needs to be disabled.
Disable TX prefetch on boot when non MHI configuration is detected.

CRs-Fixed: 1097871
Change-Id: I4107f3e54293421b9b4fdbcb62a09528bb6b775c
Acked-by: Ady Abraham <adya@qti.qualcomm.com>
Signed-off-by: Skylar Chang <chiaweic@codeaurora.org>
Signed-off-by: Amir Levy <alevy@codeaurora.org>