Include 'interrupts' property and provide a suitable example for using a GPIO interrupt line. Signed-off-by: Nishant Malpani <nish.malpani25@gmail.com> Link: https://lore.kernel.org/r/20200910180450.29696-3-nish.malpani25@gmail.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>