Fix warnigns in frameworks/av/services/radio.

- Fixes a number of "suggest braces around initialization of subobject"
warnings. [-Wmissing-braces]
- Fixes assignment operation.

Bug: 27151636
Change-Id: Id468ff7be4914c04224fd4430ccd128e7f3a89c8
diff --git a/services/radio/RadioService.cpp b/services/radio/RadioService.cpp
index 57697f3..5a3f750 100644
--- a/services/radio/RadioService.cpp
+++ b/services/radio/RadioService.cpp
@@ -735,7 +735,7 @@
         }
     } else {
         mConfig = *config;
-        status == INVALID_OPERATION;
+        status = INVALID_OPERATION;
     }
 
     return status;