uwb: Default HAL implementation

Skeletal implementation of UWB HAL which will be used for
cuttlefish/reference implementation in the future.

Bug: 195992658
Test: Manual verification of HAL booting up and handling HAL
API calls.

Change-Id: I894b7aef893ff2ed4f287f72471326b5211245c3
diff --git a/uwb/aidl/Android.bp b/uwb/aidl/Android.bp
index 989815e..5d21753 100755
--- a/uwb/aidl/Android.bp
+++ b/uwb/aidl/Android.bp
@@ -23,6 +23,7 @@
                 enabled: true,
             },
             apex_available: [
+                "//apex_available:platform",
                 "com.android.uwb",
             ],
             min_sdk_version: "current",