drm/i915: Use min() instead of hand rolling it

Most places in the vblank code use min() to clamp scanline
counters below vtotal. But we missed one in the gen3/4
pixel counter based codepath.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230404175431.23064-3-ville.syrjala@linux.intel.comReviewed-by: Mitul Golani <mitulkumar.ajitkumar.golani@intel.com>

drivers/gpu/drm/i915/display/intel_vblank.c

@@ -340,8 +340,7 @@ static bool i915_get_crtc_scanoutpos(struct drm_crtc *_crtc,
 		 * matches how the scanline counter based position works since
 		 * the scanline counter doesn't count the two half lines.
 		 */
-		if (position >= vtotal)
-			position = vtotal - 1;
+		position = min(position, vtotal - 1);
 
 		/*
 		 * Start of vblank interrupt is triggered at start of hsync,