staging/xgifb: Remove superfluous header includes

This patch removes all unnecessary, redundant and superfluous header
includes from xgifb.

Tested on hp t5325 (XGI Z11)

Signed-off-by: Peter Huewe <peterhuewe@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 files changed