[PATCH] gpio/rockchip: needs GENERIC_IRQ_CHIP to fix build errors

[Randy Dunlap <rdunlap@xxxxxxxxxxxxx>]

gpio-rockchip uses interfaces that are provided by the Kconfig
symbol GENERIC_IRQ_CHIP, so the driver should select that symbol
in order to prevent build errors.

Fixes these build errors (and more):

aarch64-linux-ld: drivers/gpio/gpio-rockchip.o: in function `rockchip_irq_disable':
gpio-rockchip.c:(.text+0x454): undefined reference to `irq_gc_mask_set_bit'
aarch64-linux-ld: drivers/gpio/gpio-rockchip.o: in function `rockchip_irq_enable':
gpio-rockchip.c:(.text+0x478): undefined reference to `irq_gc_mask_clr_bit'
aarch64-linux-ld: drivers/gpio/gpio-rockchip.o: in function `rockchip_interrupts_register':
gpio-rockchip.c:(.text+0x518): undefined reference to `irq_generic_chip_ops'
aarch64-linux-ld: gpio-rockchip.c:(.text+0x594): undefined reference to `__irq_alloc_domain_generic_chips'
aarch64-linux-ld: gpio-rockchip.c:(.text+0x5cc): undefined reference to `irq_get_domain_generic_chip'
aarch64-linux-ld: gpio-rockchip.c:(.text+0x5e0): undefined reference to `irq_gc_ack_set_bit'
aarch64-linux-ld: gpio-rockchip.c:(.text+0x604): undefined reference to `irq_gc_set_wake'

Fixes: 936ee2675eee ("gpio/rockchip: add driver for rockchip gpio")
Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Reported-by: kernel test robot <lkp@xxxxxxxxx>
---
 drivers/gpio/Kconfig |    1 +
 1 file changed, 1 insertion(+)

--- linux-next-20211116.orig/drivers/gpio/Kconfig
+++ linux-next-20211116/drivers/gpio/Kconfig
@@ -523,6 +523,7 @@ config GPIO_REG
 config GPIO_ROCKCHIP
 	tristate "Rockchip GPIO support"
 	depends on ARCH_ROCKCHIP || COMPILE_TEST
+	select GENERIC_IRQ_CHIP
 	select GPIOLIB_IRQCHIP
 	default ARCH_ROCKCHIP
 	help