Update sysui aconfig to be visible to platform_testing

platform_testing needs access to the sysui aconfig flags

Add this particular package as visible.

Bug: 314823675
Flag: NONE
Test: that the build runs and platform_testing can utilize the aconfig flags
Change-Id: Iae0b2b5c009d46bbbc3c0e7d0d4edbd0f5b1e702
diff --git a/packages/SystemUI/aconfig/Android.bp b/packages/SystemUI/aconfig/Android.bp
index e842967..50ed7ab 100644
--- a/packages/SystemUI/aconfig/Android.bp
+++ b/packages/SystemUI/aconfig/Android.bp
@@ -23,6 +23,7 @@
     default_visibility: [
         "//visibility:override",
         "//frameworks/base/packages/SystemUI:__subpackages__",
+        "//platform_testing:__subpackages__"
     ],
 }