Hello, and welcome.
The error message regarding firmware is for the Intel WiFi.
OpenBSD is not discovering a hard drive controller, such as a SATA controller. I do not know why. And, I do not know if it would make a difference, but you are running a BIOS version "A09" while Dell has a version "A15" for that laptop.
http://www.dell.com/support/home/us/...rabook/drivers