drm/nv4c/mc: nv4x igp's have a different msi rearm register

See https://bugs.freedesktop.org/show_bug.cgi?id=74492

Reported-by: Ronald <ronald645@gmail.com>
Suggested-by: Marcin Kościelnicki <koriakin@0x04.net>
Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

diff --cc drivers/gpu/drm/nouveau/Makefile
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/engine/device/nv40.c
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/include/subdev/mc.h
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/subdev/mc/nv04.h
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/subdev/mc/nv44.c
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/subdev/mc/nv4c.c
Simple merge