wavemobile-sim: write mnc-length field ine EF.AD

The length field in wavemobile sim cards is not set, so that the field
stays at its initial value, which is 0xFF. Lets write the correct mnc
length here.

Change-Id: Ieda0ce864bf3e8c7b92f062eaa3a5482c98507e2
Related: OS#3850

pySim/cards.py

@@ -896,6 +896,12 @@ class WavemobileSim(Card):
 			if sw != '9000':
 				print("Programming OPLMNwAcT failed with code %s"%sw)
 
+                # EF.AD
+                if p.get('mcc') and p.get('mnc'):
+			sw = self.update_ad(p['mnc'])
+			if sw != '9000':
+				print("Programming AD failed with code %s"%sw)
+
                 return None
 
 	def erase(self):