configfs: switch ->default groups to a linked list

configfs: switch ->default groups to a linked list

Replace the current NULL-terminated array of default groups with a linked
list.  This gets rid of lots of nasty code to size and/or dynamically
allocate the array.

While we're at it also provide a conveniant helper to remove the default
groups.

Signed-off-by: Christoph Hellwig <[email protected]>
Acked-by: Felipe Balbi <[email protected]>		[drivers/usb/gadget]
Acked-by: Joel Becker <[email protected]>
Acked-by: Nicholas Bellinger <[email protected]>
Reviewed-by: Sagi Grimberg <[email protected]>