[PATCH] irqchip/irqchip-goldfish-pic: select GENERIC_IRQ_CHIP to fix build

[Randy Dunlap]

irq-goldfish-pic uses GENERIC_IRQ_CHIP interfaces so select that symbol
to fix build errors.

Fixes these build errors:

mips-linux-ld: drivers/irqchip/irq-goldfish-pic.o: in function `goldfish_pic_of_init':
irq-goldfish-pic.c:(.init.text+0xc0): undefined reference to `irq_alloc_generic_chip'
mips-linux-ld: irq-goldfish-pic.c:(.init.text+0xf4): undefined reference to `irq_gc_unmask_enable_reg'
mips-linux-ld: irq-goldfish-pic.c:(.init.text+0xf8): undefined reference to `irq_gc_unmask_enable_reg'
mips-linux-ld: irq-goldfish-pic.c:(.init.text+0x100): undefined reference to `irq_gc_mask_disable_reg'
mips-linux-ld: irq-goldfish-pic.c:(.init.text+0x104): undefined reference to `irq_gc_mask_disable_reg'
mips-linux-ld: irq-goldfish-pic.c:(.init.text+0x11c): undefined reference to `irq_setup_generic_chip'
mips-linux-ld: irq-goldfish-pic.c:(.init.text+0x168): undefined reference to `irq_remove_generic_chip'

Fixes: 4235ff50cf98 ("irqchip/irq-goldfish-pic: Add Goldfish PIC driver")
Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Cc: Miodrag Dinic <miodrag.dinic@xxxxxxxx>
Cc: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
Cc: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Marc Zyngier <maz@xxxxxxxxxx>
Cc: Goran Ferenc <goran.ferenc@xxxxxxxx>
Cc: Aleksandar Markovic <aleksandar.markovic@xxxxxxxx>
---
 drivers/irqchip/Kconfig |    1 +
 1 file changed, 1 insertion(+)

--- linux-next-20210903.orig/drivers/irqchip/Kconfig
+++ linux-next-20210903/drivers/irqchip/Kconfig
@@ -409,6 +409,7 @@ config MESON_IRQ_GPIO
 config GOLDFISH_PIC
        bool "Goldfish programmable interrupt controller"
        depends on MIPS && (GOLDFISH || COMPILE_TEST)
+       select GENERIC_IRQ_CHIP
        select IRQ_DOMAIN
        help
          Say yes here to enable Goldfish interrupt controller driver used