Add work-around for bug #3167
"UEFI boot hangs right after initializing UEFI framebuffer."
It actually boots but the system console is not shown.
I had this issue on a TUXEDO InfinityBook Pro 14v4.
This commits allows me to boot by setting loader tunable
machdep.hack_efifb_probe_early=1.
This commit is not intended to be there forever.
It's there for people who experience the same issue and want
a quick and easy way to test if this fixes their booting issue.
Discussed-with: dillon
UnifiedSplitRaw