Move existing UWB API classes to UWB apex

Following instructions from go/mainline-java-lib to move the existing
UWB API classes to the new apex.

Bug: 194906542
Test: Compiles
Change-Id: I08801b418c7ba42c76952f5a80745cd0057ca329
diff --git a/Android.bp b/Android.bp
index 3afd6ec..c156774 100644
--- a/Android.bp
+++ b/Android.bp
@@ -156,6 +156,7 @@
         "framework-sdkextensions.stubs.module_lib",
         "framework-statsd.stubs.module_lib",
         "framework-tethering.stubs.module_lib",
+        "framework-uwb.stubs.module_lib",
         "framework-wifi.stubs.module_lib",
     ],
     sdk_version: "module_current",
@@ -178,6 +179,7 @@
         "framework-sdkextensions.impl",
         "framework-statsd.impl",
         "framework-tethering.impl",
+        "framework-uwb.impl",
         "framework-wifi.impl",
         "updatable-media",
     ],