include/linux/screen_info.h: remove unused ORIG_* macros

The ORIG_* macros definitions to access struct screen_info members and all
of their users were removed 7 years ago by commit 3ea33510
("Remove magic macros for screen_info structure members"), but (only) the
definitions reappeared a few days later in commit ee8e7cfe ("Make
asm-x86/bootparam.h includable from userspace.").

Remove them for good. Amen.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>