gpiolib: fix gpiochip_machine_hog()

There is a shifter vs vanilla mask bug here.  We want to test if 1 << 11
is set but we're testing if 0xb is set.

Fixes: 9a6c505f7df1 ("gpiolib: add hogs support for machine code")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>