drm/i915: Shrink per-platform watermark configuration

Use types of more appropriate size in struct
intel_watermark_params to save 512 bytes of .rodata.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Acked-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 1663000..07b93f2 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -799,11 +799,11 @@
 };
 
 struct intel_watermark_params {
-	unsigned long fifo_size;
-	unsigned long max_wm;
-	unsigned long default_wm;
-	unsigned long guard_size;
-	unsigned long cacheline_size;
+	u16 fifo_size;
+	u16 max_wm;
+	u8 default_wm;
+	u8 guard_size;
+	u8 cacheline_size;
 };
 
 struct cxsr_latency {