MCS: remove dead code

As a preparation for (M)CS fixes in follow-up patches, remove unused
operators from GprsCodingScheme class.

Change-Id: Ieef3b095a6732300e5efa395b989843112b9ca78
diff --git a/src/gprs_coding_scheme.h b/src/gprs_coding_scheme.h
index 6087416..1acb14b 100644
--- a/src/gprs_coding_scheme.h
+++ b/src/gprs_coding_scheme.h
@@ -212,20 +212,6 @@
 		GprsCodingScheme::Scheme(a) < GprsCodingScheme::Scheme(b);
 }
 
-inline bool operator >(GprsCodingScheme a, GprsCodingScheme b)
-{
-	return b < a;
-}
-
-inline bool operator <=(GprsCodingScheme a, GprsCodingScheme b)
-{
-	return a == b || a < b;
-}
-
-inline bool operator >=(GprsCodingScheme a, GprsCodingScheme b)
-{
-	return a == b || a > b;
-}
 inline GprsCodingScheme::Scheme GprsCodingScheme::get_retx_mcs(
 				const GprsCodingScheme mcs,
 				const GprsCodingScheme demanded_mcs,