staging: android: Use devm_kzalloc instead of kzalloc

Use devm_kzalloc instead of kzalloc in staging/android/timed_gpio.c

Signed-off-by: Georgiana Rodica Chelu <georgiana.chelu93@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>