pinctrl: cherryview: Drop ctrlX prefix from the pin debugfs output

Printing the prefix does not provide any additional information. In
addition this makes the output look more consistent with pinctrl-intel.c.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>