drm/i915: Change lfsr_converts[] to u16

All the values in the DSI PLL LFSR seed table fit into 9bits, so change
the type to u16 from u32 to save a bit of space.

 drivers/gpu/drm/i915/i915.ko:
-.rodata                        90824
+.rodata                        90760
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1458052809-23426-10-git-send-email-ville.syrjala@linux.intel.comReviewed-by: Jani Nikula <jani.nikula@intel.com>

drivers/gpu/drm/i915/intel_dsi_pll.c

@@ -35,7 +35,7 @@ struct dsi_mnp {
 	u32 dsi_pll_div;
 };
 
-static const u32 lfsr_converts[] = {
+static const u16 lfsr_converts[] = {
 	426, 469, 234, 373, 442, 221, 110, 311, 411,		/* 62 - 70 */
 	461, 486, 243, 377, 188, 350, 175, 343, 427, 213,	/* 71 - 80 */
 	106, 53, 282, 397, 454, 227, 113, 56, 284, 142,		/* 81 - 90 */