[media] mb86a20s: don't pollute dmesg with debug messages

There are a few debug tests that are shown with dev_err() or
dev_info(). Replace them by dev_dbg().

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/dvb-frontends/mb86a20s.c b/drivers/media/dvb-frontends/mb86a20s.c
index f19cd73..44bfb88 100644
--- a/drivers/media/dvb-frontends/mb86a20s.c
+++ b/drivers/media/dvb-frontends/mb86a20s.c
@@ -1095,7 +1095,7 @@
 	if (rc < 0)
 		return rc;
 	*error |= rc;
-	dev_err(&state->i2c->dev, "%s: block error for layer %c: %d.\n",
+	dev_dbg(&state->i2c->dev, "%s: block error for layer %c: %d.\n",
 		__func__, 'A' + layer, *error);
 
 	/* Read Bit Count */
@@ -1386,7 +1386,7 @@
 		return rc;
 
 	if (!(rc & 0x40)) {
-		dev_info(&state->i2c->dev, "%s: CNR is not available yet.\n",
+		dev_dbg(&state->i2c->dev, "%s: CNR is not available yet.\n",
 			 __func__);
 		return -EBUSY;
 	}
@@ -1441,7 +1441,7 @@
 
 	/* Check if data is available */
 	if (!(rc & 0x01)) {
-		dev_info(&state->i2c->dev,
+		dev_dbg(&state->i2c->dev,
 			"%s: MER measures aren't available yet.\n", __func__);
 		return -EBUSY;
 	}