Add NR2 via "u NR 2" for TS480, TS590S/SG, and QrpLabs QMX

https://github.com/Hamlib/Hamlib/issues/1625

rigs/kenwood/kenwood.c

@@ -4272,7 +4272,7 @@ int kenwood_set_func(RIG *rig, vfo_t vfo, setting_t func, int status)
         RETURNFUNC(kenwood_transaction(rig, buf, NULL, 0));
 
     case RIG_FUNC_NR:
-        if (RIG_IS_TS890S)
+        if (RIG_IS_TS890S || RIG_IS_TS590S || RIG_IS_TS590SG || RIG_IS_TS480 || RIG_IS_TS2000 || RIG_IS_QRPLABS)
         {
             char c = '1';
 

rigs/kenwood/kenwood.h

@@ -28,7 +28,7 @@
 #include "token.h"
 #include "idx_builtin.h"
 
-#define BACKEND_VER "20241001"
+#define BACKEND_VER "20241022"
 
 #define EOM_KEN ';'
 #define EOM_TH '\r'