Camera: Add default camera provider 2.4

Supports legacy camera HAL modules; also exports ICameraDevice
instances.

Test: compile
Bug: 30985004
Change-Id: I2b9624a412de95dd43979a5e6650b170010c577a
diff --git a/camera/Android.bp b/camera/Android.bp
index fb6de9e..c6a76fb 100644
--- a/camera/Android.bp
+++ b/camera/Android.bp
@@ -7,4 +7,5 @@
     "device/3.2/default",
     "metadata/3.2",
     "provider/2.4",
+    "provider/2.4/default",
 ]