Add file upload progress logging to webportal service

kestrel/src/webportal.c

@@ -325,6 +325,7 @@ int fw_data_received(const char *key, const char *value, size_t valuelen, void *
 		valuelen = fw_data->buffer_length - fw_data->current_write_offset;
 		fw_data->overflow = 1;
 	}
+	LOG_INF("File upload in progress, received %ld byte chunk, %ldkB transferred so far", valuelen, fw_data->current_write_offset / 1024);
 	memcpy(fw_data->buffer_address + fw_data->current_write_offset, value, valuelen);
 	fw_data->current_write_offset += valuelen;
 	fw_data->valid_bytes = fw_data->current_write_offset;
@@ -351,6 +352,8 @@ int firmware_upload_handler(struct mg_connection *conn, void *cbdata)
 	// Call the form handler
 	ret = mg_handle_form_request(conn, &fdh);
 
+	LOG_INF("File upload complete, received %lldkB", main_firmware_buffer.valid_bytes / 1024);
+
 	// Clear out the remainder of the buffer
 	memset(main_firmware_buffer.buffer_address + main_firmware_buffer.valid_bytes, 0xff, main_firmware_buffer.buffer_length - main_firmware_buffer.valid_bytes);