Allow system_server to read property for usb uvc gadget enabled support

Bug: 372931277

Test: @TestApi served by system_server used by CameraDeviceInfo cts fetches
      webcam support correctly

Flag: EXEMPT; bugfix

Change-Id: Ice3e3a9e1f3478ff5bb3a44da9cc263688cc821d
Signed-off-by: Jayant Chowdhary <jchowdhary@google.com>
diff --git a/private/system_server.te b/private/system_server.te
index 92caa60..4e5112e 100644
--- a/private/system_server.te
+++ b/private/system_server.te
@@ -849,6 +849,9 @@
 # Read device's serial number from system properties
 get_prop(system_server, serialno_prop)
 
+# Read whether uvc gadget is enabled
+get_prop(system_server, usb_uvc_enabled_prop)
+
 # Read/write the property which keeps track of whether this is the first start of system_server
 set_prop(system_server, firstboot_prop)