wifi: rt2x00: use explicitly signed or unsigned types

On some platforms, `char` is unsigned, but this driver, for the most
part, assumed it was signed. In other places, it uses `char` to mean an
unsigned number, but only in cases when the values are small. And in
still other places, `char` is used as a boolean. Put an end to this
confusion by declaring explicit types, depending on the context.

Cc: Andrew Morton <[email protected]>
Cc: Andy Shevchenko <[email protected]>
Cc: Stanislaw Gruszka <[email protected]>
Cc: Helmut Schaa <[email protected]>
Cc: Kalle Valo <[email protected]>
Signed-off-by: Jason A. Donenfeld <[email protected]>
Acked-by: Stanislaw Gruszka <[email protected]>
Signed-off-by: Kalle Valo <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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