Revert "fix(firmware/include/gpt.h): Set signature to CoreOS"

This reverts commit fb1c0619bdd1d86da9a345077ea15913430335da.

A couple issues here, GPT_HEADER_SIGNATURE2 must be the same length as
the generic GPT_HEADER_SIGNATURE but this commit broke that assumption.
Also, all of our images use GPT_HEADER_SIGNATURE, "EFI PART". The
purpose of this value is to hide EFI partition tables from Windows to
support some hacky ChromeOS/Windows dual boot scheme. See b7b865cf

Just revert back to the upstream value, we don't need to touch it.
1 file changed