This patch applies to the RDC 32xx ethernet driver (svn r10754, first patch applied...

- re-added the parent parameter to specify a netdevice to steal the MAC address from (optional).
- fixed null pointer access in r6040_rx() (lp->dev init. was missing)
- fixed "scheduling while atomic" endless loop if tx_timeout() was called (caused by the re-allocs of the buffers)
- fixed tx timeouts (tx irq weren't re-enabled on rx irq)

It adds some defines and cleans the code a bit (IMHO).

Signed-Off by Joerg Albert <jal2@gmx.de>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@11507 3c298f89-4303-0410-b956-a3cf2f4a3e73