staging: ks7010: simplify module_init/exit

The printouts are not needed, the driver core has enough debug output
for this if wanted. So, use a helper to save boilerplate code.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>