igc: Lift TAPRIO schedule restriction

[ Upstream commit a5fd3946 ]

Add support for Qbv schedules where one queue stays open
in consecutive entries. Currently that's not supported.

Example schedule:

|tc qdisc replace dev ${INTERFACE} handle 100 parent root taprio num_tc 3 \
|   map 2 2 1 0 2 2 2 2 2 2 2 2 2 2 2 2 \
|   queues 1@0 1@1 2@2 \
|   base-time ${BASETIME} \
|   sched-entry S 0x01 300000 \ # Stream High/Low
|   sched-entry S 0x06 500000 \ # Management and Best Effort
|   sched-entry S 0x04 200000 \ # Best Effort
|   flags 0x02

Signed-off-by: Kurt Kanzenbach <kurt@linutronix.de>
Reviewed-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
Tested-by: Naama Meir <naamax.meir@linux.intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Stable-dep-of: 72abeedd ("igc: Set Qbv start_time and end_time to end_time if not being configured in GCL")
Signed-off-by: Sasha Levin <sashal@kernel.org>