net: ethernet: ti: am65-cpsw: Fix set channel operation

The set channel operation "ethtool -L tx <n>" broke with
the recent suspend/resume changes.

Revert back to original driver behaviour of not freeing
the TX/RX IRQs at am65_cpsw_nuss_common_stop(). We will
now free them only on .suspend() as we need to release
the DMA channels (as DMA looses context) and re-acquiring
them on .resume() may not necessarily give us the same
IRQs.

Introduce am65_cpsw_nuss_remove_rx_chns() which is similar
to am65_cpsw_nuss_remove_tx_chns() and invoke them both in
.suspend().

At .resume() call am65_cpsw_nuss_init_rx/tx_chns() to
acquire the DMA channels.

To as IRQs need to be requested after knowing the IRQ
numbers, move am65_cpsw_nuss_ndev_add_tx_napi() call to
am65_cpsw_nuss_init_tx_chns().

Also fixes the below warning during suspend/resume on multi
CPU system.

[   67.347684] ------------[ cut here ]------------
[   67.347700] Unbalanced enable for IRQ 119
[   67.347726] WARNING: CPU: 0 PID: 1080 at kernel/irq/manage.c:781 __enable_irq+0x4c/0x80
[   67.347754] Modules linked in: wlcore_sdio wl18xx wlcore mac80211 libarc4 cfg80211 rfkill crct10dif_ce sch_fq_codel ipv6
[   67.347803] CPU: 0 PID: 1080 Comm: rtcwake Not tainted 6.1.0-rc4-00023-gc826e5480732-dirty #203
[   67.347812] Hardware name: Texas Instruments AM625 (DT)
[   67.347818] pstate: 400000c5 (nZcv daIF -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[   67.347829] pc : __enable_irq+0x4c/0x80
[   67.347838] lr : __enable_irq+0x4c/0x80
[   67.347846] sp : ffff80000999ba00
[   67.347850] x29: ffff80000999ba00 x28: ffff0000011c1c80 x27: 0000000000000000
[   67.347863] x26: 00000000000001f4 x25: ffff000001058358 x24: ffff000001059080
[   67.347876] x23: ffff000001058080 x22: ffff000001060000 x21: 0000000000000077
[   67.347888] x20: ffff0000011c1c80 x19: ffff000001429600 x18: 0000000000000001
[   67.347900] x17: 0000000000000080 x16: fffffc000176e008 x15: ffff0000011c21b0
[   67.347913] x14: 0000000000000000 x13: 3931312051524920 x12: 726f6620656c6261
[   67.347925] x11: 656820747563205b x10: 000000000000000a x9 : ffff80000999ba00
[   67.347938] x8 : ffff800009121068 x7 : ffff80000999b810 x6 : 00000000fffff17f
[   67.347950] x5 : ffff00007fb99b18 x4 : 0000000000000000 x3 : 0000000000000027
[   67.347962] x2 : ffff00007fb99b20 x1 : 50dd48f7f19deb00 x0 : 0000000000000000
[   67.347975] Call trace:
[   67.347980]  __enable_irq+0x4c/0x80
[   67.347989]  enable_irq+0x4c/0xa0
[   67.347999]  am65_cpsw_nuss_ndo_slave_open+0x4b0/0x568
[   67.348015]  am65_cpsw_nuss_resume+0x68/0x160
[   67.348025]  dpm_run_callback.isra.0+0x28/0x88
[   67.348040]  device_resume+0x78/0x160
[   67.348050]  dpm_resume+0xc0/0x1f8
[   67.348057]  dpm_resume_end+0x18/0x30
[   67.348063]  suspend_devices_and_enter+0x1cc/0x4e0
[   67.348075]  pm_suspend+0x1f8/0x268
[   67.348084]  state_store+0x8c/0x118
[   67.348092]  kobj_attr_store+0x18/0x30
[   67.348104]  sysfs_kf_write+0x44/0x58
[   67.348117]  kernfs_fop_write_iter+0x118/0x1a8
[   67.348127]  vfs_write+0x31c/0x418
[   67.348140]  ksys_write+0x6c/0xf8
[   67.348150]  __arm64_sys_write+0x1c/0x28
[   67.348160]  invoke_syscall+0x44/0x108
[   67.348172]  el0_svc_common.constprop.0+0x44/0xf0
[   67.348182]  do_el0_svc+0x2c/0xc8
[   67.348191]  el0_svc+0x2c/0x88
[   67.348201]  el0t_64_sync_handler+0xb8/0xc0
[   67.348209]  el0t_64_sync+0x18c/0x190
[   67.348218] ---[ end trace 0000000000000000 ]---

Fixes: cbdde66 ("net: ethernet: ti: am65-cpsw: Add suspend/resume support")
Signed-off-by: Roger Quadros <[email protected]>
Signed-off-by: Vignesh Raghavendra <[email protected]>