qcacld-3.0: Add complete wlan_start_comp at hdd_wlan_startup

As part of I707054c44a882f6dd4a4a9df2b6821b93b724f7a, completion
of wlan_start_comp variable is removed at hdd_wlan_startup,
that leads to timeout crash waiting for driver registration.

Add complete wlan_start_comp at hdd_wlan_startup.

Change-Id: I2e80465cd1ec66b9330b8f6e9b11fd14076035eb
CRs-Fixed: 2017668

core/hdd/src/wlan_hdd_main.c

@@ -8908,6 +8908,7 @@ int hdd_wlan_startup(struct device *dev)
 	qdf_mc_timer_start(&hdd_ctx->iface_change_timer,
 			   hdd_ctx->config->iface_change_wait_time * 5000);
 
+	complete(&wlan_start_comp);
 	goto success;
 
 err_close_adapters: