[aml] Do not disable keyboard auto-repeat for Meson6 and higher

Amlogic Meson6 and higher SoCs don't suffer anymore from the
kernel bug mentioned in comments as they predecessors,
so there's no need to disable the keyboard auto-repeat.
Merge pull request #5890 from codesnake/aml_kbd_autorepeat

[aml] Do not disable keyboard auto-repeat for Meson6 and higher