Comment 25 for bug 1785033

Test with Intel software development platform on Trusty with the grub2 trusty-proposed, after updating the grub-efi-amd64(signed), got the correct 64-bit efi linear frame buffer address

[ 1.295327] efifb: probing for efifb
[ 1.295344] efifb: framebuffer at 0x4000000000, mapped to 0xffffc90001000000, using 14400k, total 14400k
[ 1.295346] efifb: mode is 2560x1440x32, linelength=10240, pages=1
[ 1.295347] efifb: scrolling: redraw
[ 1.295349] efifb: Truecolor: size=8:8:8:8, shift=24:16:8:0