RANAP: Replace the last remainng TBCD-STRING with OCTET STRING

in order to work around a bug in asn1c.  When we keep the original
TBCD-STRING, the APER-encoded PLMNidentity always has an extra leading
length byte that the decoder doesn't expect.
diff --git a/asn1/ranap/RANAP-IEs.asn b/asn1/ranap/RANAP-IEs.asn
index 78fcfbe..843ec8d 100644
--- a/asn1/ranap/RANAP-IEs.asn
+++ b/asn1/ranap/RANAP-IEs.asn
@@ -1334,7 +1334,7 @@
 
 
 
-PLMNidentity 				::= TBCD-STRING (SIZE (3))
+PLMNidentity 				::= OCTET STRING (SIZE (3))
 
 PLMNs-in-shared-network ::= SEQUENCE (SIZE (1..maxNrOfPLMNsSN)) OF
 	SEQUENCE {