audio: Use the canonical direction port direction in ModuleUsb

Instead of relying on the device type, use the 'AudioPort.flags'
field to determine the device direction.

Remove 'isUsbInputDeviceType' and 'isUsbOutputtDeviceType'
as they are too specific to particular device type and just
add a maintenance burden.

Bug: 266216550
Test: m
Change-Id: Ia1b9330c2b419a1a4048ed78d914d05c1caf523f
(cherry picked from commit 64fd6bd7)
Merged-In: Ia1b9330c2b419a1a4048ed78d914d05c1caf523f