sparc: copy asm-sparc64/fbio.h to asm-sparc

There were only a few trivial changes and a few additions
in the sparc64 variant of this file.
This patch copies the sparc64 specific bits to the sparc version
of fbio.h so they are equal. A later patch will merge the two.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>