Cleanup RadioOnHelper and supporting methods

Minor changes to comments and fixs possible bug
introduced in refactor: The phone type should
be saved before the radio is turned on in order
for the TelephonyConnectionService to switch
the phone type later if it changes when the
call is placed.

Test: Telephony Unit Tests
Change-Id: Id6c1c3299bacbb4335cb5bf62f76de7a7b90a298
diff --git a/proguard.flags b/proguard.flags
index e8646eb..c707f76 100644
--- a/proguard.flags
+++ b/proguard.flags
@@ -7,4 +7,4 @@
 -keepclassmembers class * {
 @**.NeededForTesting *;
 }
--verbose
+-verbose
\ No newline at end of file