staging: et131x: use dma_alloc... instead of pci_alloc...

Use dma_allocs instead of pci_allocs, so we can use GFP_KERNEL
allocations.

Also removed this item from the TODO list

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