MLK-19341 brcmfmac: bcmsdh: add shutdown handler to avoid kernel panic on reboot

MLK-19341 brcmfmac: bcmsdh: add shutdown handler to avoid kernel panic on reboot

When running wlan interface up/down stress test in background then run
reboot command, there have kernel panic as below message.
This issue is fixed by doing cleanup in shutdown handler.

Unable to handle kernel paging request at virtual address 7f0e9040
pgd = 86c20000
[7f0e9040] *pgd=86ecd811, *pte=00000000, *ppte=00000000
Internal error: Oops: 7 [#1] PREEMPT SMP ARM
task: 8603c000 task.stack: 86040000
PC is at device_shutdown+0x198/0x204
LR is at _raw_spin_unlock_irq+0x28/0x54
pc : [<804ee520>]    lr : [<809a70dc>]    psr: 20030013
sp : 86041e60  ip : 00000000  fp : 80c5b7e4
r10: 80cb0b24  r9 : 80f7e020  r8 : 86b0b844
r7 : 80fdce84  r6 : 86b0b810  r5 : 80f34ef0  r4 : 86b0b81c
r3 : 7f0e9018  r2 : ffffffff  r1 : 00000002  r0 : 00000000
Flags: nzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
Control: 10c53c7d  Table: 86c2006a  DAC: 00000051
Process systemd-shutdow (pid: 1, stack limit = 0x86040210)
Stack: (0x86041e60 to 0x86042000)
1e60: 00000000 00000000 80f0f704 aef99500 fee1dead 80107c44 86040000 00000000
1e80: 7eee5fd4 8014bb74 00000000 8014bdcc 00000000 00000000 00000000 8020464c
1ea0: 87336540 00000000 00000000 00000000 861b24e0 87336548 00000024 00000002
1ec0: 00000000 00000005 0000001e 80205c34 00000000 00000000 1c4a66cc 87336540
1ee0: 00000000 86041f08 86041f80 00000000 00000000 80205d5c 86041f04 86041f08
1f00: 00000000 00000000 00000001 00000000 00000024 86041f20 00000005 7eee521c
1f20: 7eee5350 00000004 7eee5f1c 00000010 7eee5364 00000005 7eee53f4 0000000a
1f40: 76ece6fc 00000001 86005b00 00000005 fffffffe fffffffe 86d1a000 fffff000
1f60: 80107c44 87336540 87336540 00000000 7eee5318 80205df0 00000000 00000004
1f80: 00000000 00000000 00000000 7eee53f4 7eee5318 00000000 00000000 00000000
1fa0: 00000058 80107a60 00000000 00000000 fee1dead 28121969 01234567 aef99500
1fc0: 00000000 00000000 00000000 00000058 00000000 ffffffff 00000000 7eee5fd4
1fe0: 004a0e18 7eee5c44 0048afa4 76d0b5e0 60030010 fee1dead 00000000 00000000
[<804ee520>] (device_shutdown) from [<8014bb74>] (kernel_restart+0xc/0x50)
[<8014bb74>] (kernel_restart) from [<8014bdcc>] (SyS_reboot+0xc8/0x1ac)
[<8014bdcc>] (SyS_reboot) from [<80107a60>] (ret_fast_syscall+0x0/0x54)
Code: eaffffb5 e5943040 e3530000 0afffff3 (e5933028)
---[ end trace cb8c3d96d6f26a91 ]---

Reviewed-by: Richard Zhu <hongxing.zhu@nxp.com>
Signed-off-by: Fugang Duan <fugang.duan@nxp.com>