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

This patch applies to the RDC 32xx ethernet driver (svn r10754, first patch applied) and fixes the following issues:
- 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