Staging: gs_fpgaboot: fix data types in gs_fpgaboot.c

This is a patch to gs_fpgaboot.c to convert data types to kernel types
as identified by checkpatch.pl.

Signed-off-by: Ben Marsh <bmarsh94@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>