iter5 sweep: remove iter1 ENTER traces (13 call sites across 4 files)

Removes the iter1 patch-0014 ENTER traces from buffer.c, image.c,
picture.c, surface.c. These were diagnostic-only entry-point logs
added during iter1's "where does Firefox RDD crash?" investigation.
With the iter1+iter2+iter3+iter4 fixes landed, the entry-point
traces are pure noise.

If a future investigation needs entry-point coverage, strace -e trace
on the libva consumer process gives equivalent visibility without
modifying the driver.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/image.c

@@ -125,7 +125,6 @@ VAStatus RequestCreateImage(VADriverContextP context, VAImageFormat *format,
 
 VAStatus RequestDestroyImage(VADriverContextP context, VAImageID image_id)
 {
-	request_log("ENTER RequestDestroyImage(img=%u)\n", image_id);
 
 	struct request_data *driver_data = context->pDriverData;
 	struct object_image *image_object;
@@ -186,7 +185,6 @@ VAStatus RequestDeriveImage(VADriverContextP context, VASurfaceID surface_id,
 	VAImageFormat format;
 	VAStatus status;
 
-	request_log("ENTER RequestDeriveImage(surf=%u)\n", surface_id);
 
 	surface_object = SURFACE(driver_data, surface_id);
 	if (surface_object == NULL)
@@ -237,7 +235,6 @@ VAStatus RequestDeriveImage(VADriverContextP context, VASurfaceID surface_id,
 VAStatus RequestQueryImageFormats(VADriverContextP context,
 				  VAImageFormat *formats, int *formats_count)
 {
-	request_log("ENTER RequestQueryImageFormats\n");
 
 	/*
 	 * Populate the VAImageFormat fully per VAAPI spec for NV12 —
@@ -277,8 +274,6 @@ VAStatus RequestGetImage(VADriverContextP context, VASurfaceID surface_id,
 	struct object_image *image_object;
 	VAImage *image;
 
-	request_log("ENTER RequestGetImage(surf=%u, x=%d y=%d w=%u h=%u, img=%u)\n",
-		    surface_id, x, y, width, height, image_id);
 
 	surface_object = SURFACE(driver_data, surface_id);
 	if (surface_object == NULL)