Remove slot2 instance QcRilAudio HAL

The device doesn't support MSIM and
hence the second instance of the QcRilAudio
HAL won't be available.

cherry picked from e7427bc226af55b44d5e7a440446cd7a111c6e32

BUG=65255945
Test: lshal doesn't show slot2 on wahoo
Change-Id: I22baba6ce215422a729914820f32303ed2de0c85
diff --git a/manifest.xml b/manifest.xml
index b4d1c71..72559d6 100644
--- a/manifest.xml
+++ b/manifest.xml
@@ -407,7 +407,6 @@
         <interface>
             <name>IQcRilAudio</name>
             <instance>slot1</instance>
-            <instance>slot2</instance>
         </interface>
     </hal>
     <hal format="hidl">