Uwb: Create a new Uwb system service

This service will intercept all UwbManager API calls and then perform
necessary permission checks before forwarding the call to the vendor
UWB service. Adding sepolicy permissions for exposing the service that
handles all public API's.

Bug: 183904955
Test: atest android.uwb.cts.UwbManagerTest
Change-Id: Icce4d2f586926421c06e8902a91533002c380b8d
diff --git a/private/service_contexts b/private/service_contexts
index a4179b5..728df40 100644
--- a/private/service_contexts
+++ b/private/service_contexts
@@ -284,6 +284,7 @@
 usagestats                                u:object_r:usagestats_service:s0
 usb                                       u:object_r:usb_service:s0
 user                                      u:object_r:user_service:s0
+uwb                                       u:object_r:uwb_service:s0
 vcn_management                            u:object_r:vcn_management_service:s0
 vibrator                                  u:object_r:vibrator_service:s0
 vibrator_manager                          u:object_r:vibrator_manager_service:s0