drm/i915: rename VLV IOSF sideband functions logically

Rename all VLV IOSF sideband register accessor functions to
vlv_<port>_{read,write}. No functional changes.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 5a0dfca..28d14d6 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1931,11 +1931,11 @@
 int sandybridge_pcode_write(struct drm_i915_private *dev_priv, u8 mbox, u32 val);
 
 /* intel_sideband.c */
-int valleyview_punit_read(struct drm_i915_private *dev_priv, u8 addr, u32 *val);
-int valleyview_punit_write(struct drm_i915_private *dev_priv, u8 addr, u32 val);
-int valleyview_nc_read(struct drm_i915_private *dev_priv, u8 addr, u32 *val);
-u32 intel_dpio_read(struct drm_i915_private *dev_priv, int reg);
-void intel_dpio_write(struct drm_i915_private *dev_priv, int reg, u32 val);
+int vlv_punit_read(struct drm_i915_private *dev_priv, u8 addr, u32 *val);
+int vlv_punit_write(struct drm_i915_private *dev_priv, u8 addr, u32 val);
+int vlv_nc_read(struct drm_i915_private *dev_priv, u8 addr, u32 *val);
+u32 vlv_dpio_read(struct drm_i915_private *dev_priv, int reg);
+void vlv_dpio_write(struct drm_i915_private *dev_priv, int reg, u32 val);
 u32 intel_sbi_read(struct drm_i915_private *dev_priv, u16 reg,
 		   enum intel_sbi_destination destination);
 void intel_sbi_write(struct drm_i915_private *dev_priv, u16 reg, u32 value,