staging: r8723au: move * to be adjacent to pointer name

Move * in pointer types to be adjacent to pointer names per Linux
coding style.

Addresses checkpatch.pl: ERROR: "foo*    bar" should be "foo *bar"

Signed-off-by: Alison Schofield <amsfield22@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>