drm/nouveau/ltc: s/ltcg/ltc/ + cleanup

drivers/gpu/drm/nouveau/Makefile

drivers/gpu/drm/nouveau/core/engine/device/base.c

drivers/gpu/drm/nouveau/core/engine/device/gm100.c

drivers/gpu/drm/nouveau/core/engine/device/nvc0.c

drivers/gpu/drm/nouveau/core/engine/device/nve0.c

drivers/gpu/drm/nouveau/core/include/core/device.h

drivers/gpu/drm/nouveau/core/include/subdev/ltc.h

drivers/gpu/drm/nouveau/core/include/subdev/ltcg.h

drivers/gpu/drm/nouveau/core/subdev/fb/ramnvc0.c

drivers/gpu/drm/nouveau/core/subdev/ltc/base.c

drivers/gpu/drm/nouveau/core/subdev/ltc/gf100.c

drivers/gpu/drm/nouveau/core/subdev/ltc/gk104.c

drivers/gpu/drm/nouveau/core/subdev/ltc/gm107.c

drivers/gpu/drm/nouveau/core/subdev/ltc/priv.h

drivers/gpu/drm/nouveau/core/subdev/ltcg/gf100.h

drivers/gpu/drm/nouveau/core/subdev/mc/nvc0.c

drivers/gpu/drm/nouveau/core/subdev/vm/nvc0.c