staging: wilc1000: rename pstrWFIDrv of function mac_close

This patch renames pstrWFIDrv of function mac_close to hif_drv
to avoid CamelCase naming convention.
And, some debug print modification that has been included name 'pstrWFIDrv'.

Signed-off-by: Leo Kim <leo.kim@atmel.com>
Signed-off-by: Glen Lee <glen.lee@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>