irqchip/loongson-pch-lpc: Add dependence on LoongArch

The loongson-pch-lpc driver may be selected in a random
configuration, but it is only supported for LoongArch, So,
the dependence on LoongArch is added for it to avoid compile
error for a random configuration of other architetures.
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Jianmin Lv <lvjianmin@loongson.cn>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220916071926.28368-1-lvjianmin@loongson.cn

drivers/irqchip/Kconfig

@@ -628,8 +628,9 @@ config LOONGSON_PCH_MSI
 
 config LOONGSON_PCH_LPC
 	bool "Loongson PCH LPC Controller"
+	depends on LOONGARCH
 	depends on MACH_LOONGSON64
-	default (MACH_LOONGSON64 && LOONGARCH)
+	default MACH_LOONGSON64
 	select IRQ_DOMAIN_HIERARCHY
 	help
 	  Support for the Loongson PCH LPC Controller.