drm/bridge: adv7511: fix crash on irq during probe

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

drm/bridge: adv7511: fix crash on irq during probe

Moved IRQ registration down to end of adv7511_probe().

If an IRQ already is pending during adv7511_probe

(before adv7511_cec_init) then cec_received_msg_ts

could crash using uninitialized data:

Unable to handle kernel read from unreadable memory at virtual address 00000000000003d5

Internal error: Oops: 96000004 [#1] PREEMPT_RT SMP

Call trace:

cec_received_msg_ts+0x48/0x990 [cec]

adv7511_cec_irq_process+0x1cc/0x308 [adv7511]

adv7511_irq_process+0xd8/0x120 [adv7511]

adv7511_irq_handler+0x1c/0x30 [adv7511]

irq_thread_fn+0x30/0xa0

irq_thread+0x14c/0x238

kthread+0x190/0x1a8