MIPS: IP22/IP28: Improve GIO support

- added interrupt support for GIO devices
- improved detection of GIO cards on Indigo2
- added more known GIO cards

Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/7055/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

diff --cc arch/mips/include/asm/gio_device.h
Simple merge

diff --cc arch/mips/include/asm/sgi/ip22.h
Simple merge

diff --cc arch/mips/sgi-ip22/ip22-gio.c
Simple merge

diff --cc arch/mips/sgi-ip22/ip22-int.c
Simple merge