drm/nouveau/therm: move thermal-related functions to the therm subdev

It looks scary because of the size, but I tried to keep the differences minimal.
Further patches will fix the actual "driver" code and add new features.

v2: change filenames, split to submodules

v3: add a missing include

v4: Ben Skeggs <bskeggs@redhat.com>
- fixed set_defaults() to allow min_duty < 30 (thermal table will
  override this if it's actually necessary)
- fixed set_defaults() to not provide pwm_freq so nv4x (which only has
  pwm_div) can actually work.  the boards using pwm_freq will have a
  thermal table entry to provide us the value.
- removed unused files

Signed-off-by: Martin Peres <martin.peres@labri.fr>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/Makefile b/drivers/gpu/drm/nouveau/Makefile
index 1b05d11..15d17e8 100644
--- a/drivers/gpu/drm/nouveau/Makefile
+++ b/drivers/gpu/drm/nouveau/Makefile
@@ -91,6 +91,12 @@
 nouveau-y += core/subdev/mxm/base.o
 nouveau-y += core/subdev/mxm/mxms.o
 nouveau-y += core/subdev/mxm/nv50.o
+nouveau-y += core/subdev/therm/base.o
+nouveau-y += core/subdev/therm/fan.o
+nouveau-y += core/subdev/therm/ic.o
+nouveau-y += core/subdev/therm/nv40.o
+nouveau-y += core/subdev/therm/nv50.o
+nouveau-y += core/subdev/therm/temp.o
 nouveau-y += core/subdev/timer/base.o
 nouveau-y += core/subdev/timer/nv04.o
 nouveau-y += core/subdev/vm/base.o
@@ -173,7 +179,7 @@
 nouveau-y += nv50_evo.o
 
 # drm/pm
-nouveau-y += nouveau_pm.o nouveau_volt.o nouveau_perf.o nouveau_temp.o
+nouveau-y += nouveau_pm.o nouveau_volt.o nouveau_perf.o
 nouveau-y += nv04_pm.o nv40_pm.o nv50_pm.o nva3_pm.o nvc0_pm.o
 nouveau-y += nouveau_mem.o