drm/i915: remove AGP dependency from DRM_I915 kconfig help text

We haven't required AGP since 3e99a6b9 ("drm/i915: Stop depending
upon CONFIG_AGP_INTEL"). Split/rearrange the paragraphs a bit while at
it.
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1477041257-8219-1-git-send-email-jani.nikula@intel.com

drivers/gpu/drm/i915/Kconfig

@@ -24,16 +24,17 @@ config DRM_I915
 	  including 830M, 845G, 852GM, 855GM, 865G, 915G, 945G, 965G,
 	  G35, G41, G43, G45 chipsets and Celeron, Pentium, Core i3,
 	  Core i5, Core i7 as well as Atom CPUs with integrated graphics.
-	  If M is selected, the module will be called i915.  AGP support
-	  is required for this driver to work. This driver is used by
-	  the Intel driver in X.org 6.8 and XFree86 4.4 and above. It
-	  replaces the older i830 module that supported a subset of the
-	  hardware in older X.org releases.
+
+	  This driver is used by the Intel driver in X.org 6.8 and
+	  XFree86 4.4 and above. It replaces the older i830 module that
+	  supported a subset of the hardware in older X.org releases.
 
 	  Note that the older i810/i815 chipsets require the use of the
 	  i810 driver instead, and the Atom z5xx series has an entirely
 	  different implementation.
 
+	  If "M" is selected, the module will be called i915.
+
 config DRM_I915_PRELIMINARY_HW_SUPPORT
 	bool "Enable preliminary support for prerelease Intel hardware by default"
 	depends on DRM_I915