drm/vc4: Fix deadlock on DSI device attach error

In the Linux kernel, the following vulnerability has been resolved:

drm/vc4: Fix deadlock on DSI device attach error

DSI device attach to DSI host will be done with host device's lock

held.

Un-registering host in "device attach" error path (ex: probe retry)

will result in deadlock with below call trace and non operational

DSI display.

Startup Call trace:

[ 35.043036] rt_mutex_slowlock.constprop.21+0x184/0x1b8

[ 35.043048] mutex_lock_nested+0x7c/0xc8

[ 35.043060] device_del+0x4c/0x3e8

[ 35.043075] device_unregister+0x20/0x40

[ 35.043082] mipi_dsi_remove_device_fn+0x18/0x28

[ 35.043093] device_for_each_child+0x68/0xb0

[ 35.043105] mipi_dsi_host_unregister+0x40/0x90

[ 35.043115] vc4_dsi_host_attach+0xf0/0x120 [vc4]

[ 35.043199] mipi_dsi_attach+0x30/0x48

[ 35.043209] tc358762_probe+0x128/0x164 [tc358762]

[ 35.043225] mipi_dsi_drv_probe+0x28/0x38

[ 35.043234] really_probe+0xc0/0x318

[ 35.043244] __driver_probe_device+0x80/0xe8

[ 35.043254] driver_probe_device+0xb8/0x118

[ 35.043263] __device_attach_driver+0x98/0xe8

[ 35.043273] bus_for_each_drv+0x84/0xd8

[ 35.043281] __device_attach+0xf0/0x150

[ 35.043290] device_initial_probe+0x1c/0x28

[ 35.043300] bus_probe_device+0xa4/0xb0

[ 35.043308] deferred_probe_work_func+0xa0/0xe0

[ 35.043318] process_one_work+0x254/0x700

[ 35.043330] worker_thread+0x4c/0x448

[ 35.043339] kthread+0x19c/0x1a8

[ 35.043348] ret_from_fork+0x10/0x20

Shutdown Call trace:

[ 365.565417] Call trace:

[ 365.565423] __switch_to+0x148/0x200

[ 365.565452] __schedule+0x340/0x9c8

[ 365.565467] schedule+0x48/0x110

[ 365.565479] schedule_timeout+0x3b0/0x448

[ 365.565496] wait_for_completion+0xac/0x138

[ 365.565509] __flush_work+0x218/0x4e0

[ 365.565523] flush_work+0x1c/0x28

[ 365.565536] wait_for_device_probe+0x68/0x158

[ 365.565550] device_shutdown+0x24/0x348

[ 365.565561] kernel_restart_prepare+0x40/0x50

[ 365.565578] kernel_restart+0x20/0x70

[ 365.565591] __do_sys_reboot+0x10c/0x220

[ 365.565605] __arm64_sys_reboot+0x2c/0x38

[ 365.565619] invoke_syscall+0x4c/0x110

[ 365.565634] el0_svc_common.constprop.3+0xfc/0x120

[ 365.565648] do_el0_svc+0x2c/0x90

[ 365.565661] el0_svc+0x4c/0xf0

[ 365.565671] el0t_64_sync_handler+0x90/0xb8

[ 365.565682] el0t_64_sync+0x180/0x184