Blackfin: gpio: use shorter name

The gpio label size is 16 char, but the current code uses a longer name
resulting in chopped display.  So use a shorter name.
Reported-by: Peter Meerwald <pmeerw@pmeerw.net>
Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

arch/blackfin/kernel/bfin_gpio.c

@@ -1320,7 +1320,7 @@ void bfin_gpiolib_gpio_free(struct gpio_chip *chip, unsigned gpio)
 }
 
 static struct gpio_chip bfin_chip = {
-	.label			= "Blackfin-GPIOlib",
+	.label			= "BFIN-GPIO",
 	.direction_input	= bfin_gpiolib_direction_input,
 	.get			= bfin_gpiolib_get_value,
 	.direction_output	= bfin_gpiolib_direction_output,