platform/x86: x86-android-tablets: Fix GPIO lookup leak on error-exit

Fix leaking the registered gpiod_lookup tables when the kcalloc() for the
i2c_clients array fails.

Fixes: ef2ac114 ("platform/x86: x86-android-tablets: Add support for registering GPIO lookup tables")
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20220108154947.136593-1-hdegoede@redhat.com