staging: et131x: Update TODO list - remove 'put driver into single file'

Driver now resides in a single file with a separate header with
registers, updated the README TODO list.

Signed-off-by: Mark Einon <mark.einon@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/et131x/README

@@ -8,7 +8,6 @@ Note, the powermanagement options were removed from the vendor provided
 driver as they did not build properly at the time.
 
 TODO:
-	- Put the driver into a single file, with a .h for the registers layout.
 	- rx_ring.fbr{0, 1} can probably share a common structure
 	- Use of kmem_cache seems a bit unusual
 	- Use dma_alloc_... in place of pci_alloc_...