Use BGRT image for manufacturer logo

[danirabbit]

Problem

We have this custom OEM conf that nobody uses, but manufacturers do supply an image that is widely adopted at /sys/firmware/acpi/bgrt/image

Proposal

We should drop our custom manufacturer logo thing and use the widely adopted way manufacturers already set their logo

Prior Art (Optional)

Plymouth :)

[danirabbit]

It's easy enough to just grab the image but I wonder if we should try to do something here to remove the background or something