kernel: Remove unused schedulers

These schedulers were removed in kernel 5.15.150 and 6.1.180.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
(cherry picked from commit cd450923ab066ce35e8ce55340e66986f14a42d8)

target/linux/generic/config-5.15

@@ -4133,15 +4133,12 @@ CONFIG_NET_IPGRE_BROADCAST=y
 CONFIG_NET_RX_BUSY_POLL=y
 # CONFIG_NET_SB1000 is not set
 CONFIG_NET_SCHED=y
-# CONFIG_NET_SCH_ATM is not set
 # CONFIG_NET_SCH_CAKE is not set
-# CONFIG_NET_SCH_CBQ is not set
 # 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=y
 # CONFIG_NET_SCH_DRR is not set
-# CONFIG_NET_SCH_DSMARK is not set
 # CONFIG_NET_SCH_ETF is not set
 # CONFIG_NET_SCH_ETS is not set
 CONFIG_NET_SCH_FIFO=y