drm/i915: Spell vga_switcheroo consistently

Currently everyone and their dog has their own favourite spelling
for vga_switcheroo. This makes it hard to grep dmesg for log entries
relating to vga_switcheroo. It also makes it hard to find related
source files in the tree.

vga_switcheroo.c uses pr_fmt "vga_switcheroo". Use that everywhere.
Signed-off-by: NLukas Wunner <lukas@wunner.de>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_acpi.c

@@ -146,7 +146,7 @@ static bool intel_dsm_detect(void)
 
 	if (vga_count == 2 && has_dsm) {
 		acpi_get_name(intel_dsm_priv.dhandle, ACPI_FULL_PATHNAME, &buffer);
-		DRM_DEBUG_DRIVER("VGA switcheroo: detected DSM switching method %s handle\n",
+		DRM_DEBUG_DRIVER("vga_switcheroo: detected DSM switching method %s handle\n",
 				 acpi_method_name);
 		return true;
 	}

drivers/gpu/drm/i915/intel_panel.c

@@ -821,7 +821,7 @@ void intel_panel_disable_backlight(struct intel_connector *connector)
 		return;
 
 	/*
-	 * Do not disable backlight on the vgaswitcheroo path. When switching
+	 * Do not disable backlight on the vga_switcheroo path. When switching
 	 * away from i915, the other client may depend on i915 to handle the
 	 * backlight. This will leave the backlight on unnecessarily when
 	 * another client is not activated.