Tethering: add p2p regex for shared p2p group interface

For the device does not support separate group interface,
there is only one interface, ex. p2p0, for both device and group interface.

Fixes: 141382930
Bug: 141382930
Test: atest TetheringTests
      launch GO on walleye
Change-Id: I064dd8d5dc372411ee771496813ae7c43ed037bc
diff --git a/Tethering/res/values/config.xml b/Tethering/res/values/config.xml
index c489cbc..4af5c53 100644
--- a/Tethering/res/values/config.xml
+++ b/Tethering/res/values/config.xml
@@ -47,6 +47,7 @@
          should be empty.  An example would be "p2p-p2p\\d-.*" -->
     <string-array translatable="false" name="config_tether_wifi_p2p_regexs">
         <item>"p2p-p2p\\d-.*"</item>
+        <item>"p2p\\d"</item>
     </string-array>
 
     <!-- List of regexpressions describing the interface (if any) that represent tetherable