drm/i915: Rename get stolen functions for LP platforms chv+

gen8 is used for both Broadwell and Cherryview but this
function here is only Cherryview and all next atom LP platforms.
So let's rename it to avoid confusion as suggested by Ville.

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Ander Conselvan de Oliveira <conselvan2@gmail.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1482096988-400-2-git-send-email-rodrigo.vivi@intel.com

drivers/gpu/drm/i915/i915_gem_stolen.c

@@ -360,7 +360,7 @@ static void gen7_get_stolen_reserved(struct drm_i915_private *dev_priv,
 	}
 }
 
-static void gen8_get_stolen_reserved(struct drm_i915_private *dev_priv,
+static void chv_get_stolen_reserved(struct drm_i915_private *dev_priv,
 				     unsigned long *base, unsigned long *size)
 {
 	uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
@@ -459,7 +459,7 @@ int i915_gem_init_stolen(struct drm_i915_private *dev_priv)
 			bdw_get_stolen_reserved(dev_priv, &reserved_base,
 						&reserved_size);
 		else
-			gen8_get_stolen_reserved(dev_priv, &reserved_base,
+			chv_get_stolen_reserved(dev_priv, &reserved_base,
 						 &reserved_size);
 		break;
 	}