staging: wilc1000: remove typedef from tuniHostIFkeyAttr

This patch remove typedef from the union tuniHostIFkeyAttr.
And rename it to host_if_key_attr.

Signed-off-by: Leo Kim <leo.kim@atmel.com>
Signed-off-by: Tony Cho <tony.cho@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>