Audio V4: Rename audio/device to audio/core

The name device has already too many meaning, thus rename the main audio
api to core.

Bug: 38184704
Test: compile
Change-Id: I178dfef05af8f8579196affbe2cbc5f6c3f9af55
Signed-off-by: Kevin Rocard <krocard@google.com>
diff --git a/audio/README b/audio/README
index b40bad0..2b81450 100644
--- a/audio/README
+++ b/audio/README
@@ -1,36 +1,36 @@
 Directory structure of the audio HIDL related code.
 
 audio
-|-- 2.0              <== legacy 2.0 device HIDL (.hal) can not be moved to fit
+|-- 2.0              <== legacy 2.0 core HIDL (.hal) can not be moved to fit
 |                        the directory structure because already published
 |
-|-- common           <== code common to audio device and effect API
+|-- common           <== code common to audio core and effect API
 |   |-- 2.0
 |   |   |-- default  <== code that wraps the legacy API
-|   |   `-- vts      <== vts of 2.0 device and effect API common code
+|   |   `-- vts      <== vts of 2.0 core and effect API common code
 |   |-- 4.0
 |   |   |-- default
 |   |   `-- vts
 |   |-- ...          <== The future versions should continue this structure
 |   |   |-- default
 |   |   `-- vts
-|   `-- all_versions <== code common to all version of both device and effect API
+|   `-- all_versions <== code common to all version of both core and effect API
 |       |-- default
-|       `-- vts      <== vts of device and effect API common version independent code
+|       `-- vts      <== vts of core and effect API common version independent code
 |
-|-- device           <== code relative to the device API
-|   |-- 2.0          <== 2.0 device API code (except .hal, see audio/2.0)
+|-- core           <== code relative to the core API
+|   |-- 2.0          <== 2.0 core API code (except .hal, see audio/2.0)
 |   |   |-- default
 |   |   `-- vts
 |   |-- 4.0
-|   |   |-- default  <== default implementation of the device 4.0 api
+|   |   |-- default  <== default implementation of the core 4.0 api
 |   |   `-- vts      <== vts code of the 4.0 API
 |   |-- ...
 |   |   |-- default
 |   |   `-- vts
 |   `-- all_versions
 |       |-- default
-|       `-- vts      <== vts of device API common version independent code
+|       `-- vts      <== vts of core API common version independent code
 |
 `-- effect           <== idem for the effect API
     |-- 2.0