Use PassthruPatchRecord for DIRECT to DIRECT connections

When both input and output connected by a software patch
are in 'DIRECT' mode (no framework processing), use
PassthruPatchRecord as it helps to reduce the latency
significantly by avoiding intermediate buffering.

Remove 'std::nothrow' from tracks creation in PatchPanel
for consistency with other code.

Bug: 117564323
Test: MS12 MSD, AOSP MSD
Change-Id: I52ec5b02a207548ebc4073c1033e396f444c041c