wmediumd and its companion are visible to cuttlefish

wmediumd and wmediumd_gen_config are part of cvd host tools.

Bug: 191754396
Test: m PRODUCT_ENFORCE_MAC80211_HWSIM=true
      launch_cvd launches wmediumd
Change-Id: Iddd0ff861a5bd907d06d706a49f157574602c691
diff --git a/Android.bp b/Android.bp
index fbb99c3..e398419 100644
--- a/Android.bp
+++ b/Android.bp
@@ -24,7 +24,7 @@
         "libconfig",
     ],
     visibility: [
-       "//visibility:private"
+       "//device/google/cuttlefish/build",
     ],
 }
 
@@ -58,7 +58,7 @@
         "libconfig",
     ],
     visibility: [
-       "//visibility:private"
+       "//device/google/cuttlefish/build",
     ],
     stl: "none",
     static_executable: true,