Don't set keymap if already set

[Richard Hughes]

Henrique (thinkpad_acpi maintainer) wanted to make sure we were not
setting scancode->keycode mappings for keys that had already been
assigned. We could assign the keys in the kernel driver using dmi
mapping or in userspace by already using setkeycodes in hotkey-setup.

The attached (untested) patch fixes this, but also has the side effect
of not letting the use change the fdi file mappings while testing
without rebooting or reloading the thinkpad_acpi module.

Good thing / bad thing? Patch attached for comments.

Richard.

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