kernel: generic: select the fq_codel qdisc by default

The kernel configuration allows us to select a default qdisc. Let's do this for
5.10 (as 5.4 is on its way out) and get rid of the hacky patch we've been
carrying.

Acked-by: Jo-Philipp Wich <jo@mein.io>
Signed-off-by: Rui Salvaterra <rsalvaterra@gmail.com>

target/linux/generic/config-5.10

@@ -1331,11 +1331,14 @@ CONFIG_DEBUG_KERNEL=y
 # CONFIG_DECNET is not set
 CONFIG_DEFAULT_CUBIC=y
 CONFIG_DEFAULT_DEADLINE=y
+CONFIG_DEFAULT_FQ_CODEL=y
 CONFIG_DEFAULT_HOSTNAME="(none)"
 CONFIG_DEFAULT_HUNG_TASK_TIMEOUT=120
 CONFIG_DEFAULT_INIT=""
 CONFIG_DEFAULT_MMAP_MIN_ADDR=4096
+CONFIG_DEFAULT_NET_SCH="fq_codel"
 # CONFIG_DEFAULT_NOOP is not set
+# CONFIG_DEFAULT_PFIFO_FAST is not set
 # CONFIG_DEFAULT_RENO is not set
 CONFIG_DEFAULT_SECURITY=""
 CONFIG_DEFAULT_SECURITY_DAC=y
@@ -3910,7 +3913,7 @@ CONFIG_NET_SCHED=y
 # CONFIG_NET_SCH_CBS is not set
 # CONFIG_NET_SCH_CHOKE is not set
 # CONFIG_NET_SCH_CODEL is not set
-# CONFIG_NET_SCH_DEFAULT is not set
+CONFIG_NET_SCH_DEFAULT=y
 # CONFIG_NET_SCH_DRR is not set
 # CONFIG_NET_SCH_DSMARK is not set
 # CONFIG_NET_SCH_ETF is not set