Make asm-x86/bootparam.h includable from userspace.

To actually write a bootloader (or, say, the lguest launcher)
currently requires duplication of these structures.  Making them
includable from userspace is much nicer.

We merge the common userspace-required definitions of e820_32/64.h
into e820.h for export.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
diff --git a/include/video/Kbuild b/include/video/Kbuild
index 53a6c73..0e406f7 100644
--- a/include/video/Kbuild
+++ b/include/video/Kbuild
@@ -1 +1,2 @@
 unifdef-y += sisfb.h uvesafb.h
+unifdef-y += edid.h