leds: leds-bd2802: remove set but not used variable 'pdata'

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/leds/leds-bd2802.c: In function 'bd2802_probe':
drivers/leds/leds-bd2802.c:663:35: warning:
 variable 'pdata' set but not used [-Wunused-but-set-variable]

commit 4c3718f9 ("leds: bd2802: Convert to use GPIO descriptors")
left behind this unused variable.

Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Pavel Machek <pavel@ucw.cz>