[PATCH] Add interrupt controller firmware for r6xx/r7xx chips

[Alex D. <ale...@gm...>]

These are the firmware files needed for the interrupt controller on
r6xx/r7xx chips.  Copy them to /lib/firmware/radeon/ to use interrupts
on these chips.  The license terms are listed in the attached file
(LICENSE.radeon).  These should probably go into the linux firmware
tree.

Alex