HID: unignore mouse on unibody macbooks

In commit a96d6ef3, the mouse interfaces on the unibody macbooks were
put into hid mouse ignore list. This was a little bit too premature
though, as the corresponding bcm5974 changes are scheduled for 2.6.29.

Remove these devices from the ignore list for now, in order to provide at
least basic functionality with the HID driver.

Will be reintroduced in 2.6.29

Reported-by: Henrik Rydberg <rydberg@euromail.se>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>