mfd: twl-core: Fix double "to to" in comment.

The double `to' is duplicated in the comment, remove one.

Signed-off-by: Jason Wang <wangborong@cdjrlc.com>
Signed-off-by: Lee Jones <lee@kernel.org>
Link: https://lore.kernel.org/r/20220802201757.8142-1-wangborong@cdjrlc.com