Audio V4: Remove deprecated function and enum

The debugDump function was deprecated by the introduction of the
debug method in the IBase.

AudioMode CURRENT and INVALID should not be passed to the
vendor.

Bug: 38184704
Test: none
Change-Id: I0e14c71ce7216524587a6ba28cae0cdb821bae23
Signed-off-by: Kevin Rocard <krocard@google.com>