drm/i915: Zero unused WM1 watermarks on VLV/CHV
The hardware supposedly ignores the WM1 watermarks while the PND deadline mode is enabled, but clear out the register just in case. This is what the other OS does, and it does make register dumps look more consistent when we don't have partial WM1 values lingering in the registers (some WM1 watermarks already get zeroed when the actually used DSPFW registers get written). Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: NClint Taylor <Clinton.A.Taylor@intel.com> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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