Audio HAL: Cleanup implementation

Rename files so that, if they are in a X.0 folder, their name does
not contain that version number. That allows for easier copy paste
when creating a new version.

Conversion.h was included from the all-versions instead of the X.0
headers. This in incoherent with the other headers.

Add VersionMacro.h that will be used in the follow up patch.

Also remove shim from VNDK as only stable ABI&API libraries should be
part of it.

Test: Compile
Bug: 118203066
Change-Id: I9cd77b3df5ccede5ae51c3cc94fab5939c51d9ef
Signed-off-by: Kevin Rocard <krocard@google.com>