staging: wilc1000: remove typedef from sdio_cmd53_t

This patch removes typedef from struct sdio_cmd53_t and renames it to
sdio_cmd53.

Signed-off-by: Chaehyun Lim <chaehyun.lim@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>