Remove CBQ functionality from tc

6.8+ kernel has dropped CBQ support [1], Now that OE uses 6.9 for
kernel-headers means we are hitting the undefined symbol
TCA_CBQ_MAX [2]  

[1] https://github.com/torvalds/linux/commit/33241dca486264193ed68167c8eeae1fb197f3df
[2] https://bugs.busybox.net/show_bug.cgi?id=15934

Upstream-Status: Submitted [https://bugs.busybox.net/show_bug.cgi?id=15931]
Signed-off-by: Khem Raj <raj.khem@gmail.com>

diff -up busybox-1.36.1/networking/tc.c.no-cbq busybox-1.36.1/networking/tc.c
--- busybox-1.36.1/networking/tc.c.no-cbq	2024-01-29 10:24:09.135082923 -0500
+++ busybox-1.36.1/networking/tc.c	2024-01-29 10:28:12.009502552 -0500
@@ -31,7 +31,7 @@
 //usage:	"qdisc [handle QHANDLE] [root|"IF_FEATURE_TC_INGRESS("ingress|")"parent CLASSID]\n"
 /* //usage: "[estimator INTERVAL TIME_CONSTANT]\n" */
 //usage:	"	[[QDISC_KIND] [help|OPTIONS]]\n"
-//usage:	"	QDISC_KIND := [p|b]fifo|tbf|prio|cbq|red|etc.\n"
+//usage:	"	QDISC_KIND := [p|b]fifo|tbf|prio|red|etc.\n"
 //usage:	"qdisc show [dev STRING]"IF_FEATURE_TC_INGRESS(" [ingress]")"\n"
 //usage:	"class [classid CLASSID] [root|parent CLASSID]\n"
 //usage:	"	[[QDISC_KIND] [help|OPTIONS] ]\n"
@@ -230,7 +230,7 @@ static int cbq_parse_opt(int argc, char
 {
 	return 0;
 }
-#endif
+
 static int cbq_print_opt(struct rtattr *opt)
 {
 	struct rtattr *tb[TCA_CBQ_MAX+1];
@@ -322,6 +322,7 @@ static int cbq_print_opt(struct rtattr *
  done:
 	return 0;
 }
+#endif
 
 static FAST_FUNC int print_qdisc(
 		const struct sockaddr_nl *who UNUSED_PARAM,
@@ -373,7 +374,8 @@ static FAST_FUNC int print_qdisc(
 		if (qqq == 0) { /* pfifo_fast aka prio */
 			prio_print_opt(tb[TCA_OPTIONS]);
 		} else if (qqq == 1) { /* class based queuing */
-			cbq_print_opt(tb[TCA_OPTIONS]);
+			/* cbq_print_opt(tb[TCA_OPTIONS]); */
+			printf("cbq not supported");
 		} else {
 			/* don't know how to print options for this qdisc */
 			printf("(options for %s)", name);
@@ -444,7 +446,8 @@ static FAST_FUNC int print_class(
 			/* nothing. */ /*prio_print_opt(tb[TCA_OPTIONS]);*/
 		} else if (qqq == 1) { /* class based queuing */
 			/* cbq_print_copt() is identical to cbq_print_opt(). */
-			cbq_print_opt(tb[TCA_OPTIONS]);
+			/* cbq_print_opt(tb[TCA_OPTIONS]); */
+			printf("cbq not supported");
 		} else {
 			/* don't know how to print options for this class */
 			printf("(options for %s)", name);
