greybus: interface: change typo replicable => replaceable

'user-replicable' means something that a user can replicate.
'user-replaceable' means something that a user can replace. We defintely
mean to say replaceable not replicable here.

Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>