tda19988: add missing blockdriver_announce() call

To provide EDID to fb, the TDA19988 implements the block device
protocol with libblockdriver. To properly use the library,
blockdriver_announce() should be called by the driver.

Issue reported by David van Moolenbroek

Change-Id: Id55d159d91502a9afac5c1d4de0fee1e8945b5c1

drivers/tda19988/tda19988.c

@@ -993,6 +993,7 @@ sef_cb_init(int type, sef_init_info_t * UNUSED(info))
 			i2cdriver_announce(hdmi_bus);
 		}
 
+		blockdriver_announce(type);
 		log_trace(&log, "announced\n");
 	}