Option to disable waiting for safe mode

[deshipu]

I was reading comments on a bug, and stumbled upon this comment:
#5212 (comment)

which explains why my keyboards are so slow to work when I'm switching between hosts with a KVM. I previously blamed the slow USB enumeration in general, and the KVM in particular, but this explains it.

I wonder if adding a compile-time option for skipping this wait (so that I could use it for my keyboards) would be accepted? In my case I don't particularly need the safe mode, and this would increase the comfort of working with a KVM greatly.

I also wonder if there are more such delays that could be disabled?

[tannewt]

Compile time option is fine with me. I wouldn't have it on by default though.

nRF will have a second wait time for the BLE workflow.

Perhaps we could add a safe mode pin to check at some point or maybe even a key matrix. Those checks would be fast but still allow for safe mode.

[deshipu]

Fixed by #5270