drm/i915: Replace DRM_LOG_KMS() by DRM_DEBUG_KMS()

There are only a few users of the DRM_LOG_KMS() macro. We can simplify
the DRM code a bit by replacing them by DRM_DEBUG_KMS().

Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --cc drivers/gpu/drm/i915/dvo_ch7xxx.c
Simple merge

diff --cc drivers/gpu/drm/i915/dvo_ivch.c
Simple merge

diff --cc drivers/gpu/drm/i915/dvo_ns2501.c
Simple merge

diff --cc drivers/gpu/drm/i915/dvo_sil164.c
Simple merge

diff --cc drivers/gpu/drm/i915/dvo_tfp410.c
Simple merge