Staging: vt6655: remove DWORD typedef

Replace all occurrences with unsigned long type, except for pointer fields that
should be u32 in packed structures and 8-byte-aligned 8 byte long structure
QWORD.

Thanks to Jiri Slaby for pointing out that simply replacing by unsigned long is
wrong on x86-64 arch.

Signed-off-by: Charles Clément <caratorn@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>