SimRecords.getServiceProviderName() always returned null.

Fixes bug 1955060.  spn was defined in both SimRecords and base class IccRecords.
diff --git a/telephony/java/com/android/internal/telephony/gsm/SIMRecords.java b/telephony/java/com/android/internal/telephony/gsm/SIMRecords.java
index b886410..e25de81 100644
--- a/telephony/java/com/android/internal/telephony/gsm/SIMRecords.java
+++ b/telephony/java/com/android/internal/telephony/gsm/SIMRecords.java
@@ -92,7 +92,6 @@
     byte[] mEfCfis = null;
 
 
-    String spn;
     int spnDisplayCondition;
     // Numeric network codes listed in TS 51.011 EF[SPDI]
     ArrayList<String> spdiNetworks = null;