staging: wilc1000: remove wrappers around semaphore usage

Just call up/down directly, no need for a wrapper function that hides
what is really happening.  Fix up some variable types to be the correct
structure pointers, not void *.

Cc: Johnny Kim <johnny.kim@atmel.com>
Cc: Rachel Kim <rachel.kim@atmel.com>
Cc: Dean Lee <dean.lee@atmel.com>
Cc: Chris Park <chris.park@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>