graphics: add ComposerCommandEngine

Add ComposerCommandEngine to the HAL support library to replace
ComposerClient::CommandReader and ComposerClient::mWriter.

Test: boots and VTS
Change-Id: I2d1281d37180497cbd5c623ef005cee44bce377e
diff --git a/graphics/composer/2.1/utils/hal/Android.bp b/graphics/composer/2.1/utils/hal/Android.bp
index a8ff59d..f24e768 100644
--- a/graphics/composer/2.1/utils/hal/Android.bp
+++ b/graphics/composer/2.1/utils/hal/Android.bp
@@ -27,5 +27,11 @@
         "android.hardware.graphics.mapper@2.0",
         "libhardware",
     ],
+    header_libs: [
+        "android.hardware.graphics.composer@2.1-command-buffer",
+    ],
+    export_header_lib_headers: [
+        "android.hardware.graphics.composer@2.1-command-buffer",
+    ],
     export_include_dirs: ["include"],
 }