irqchip: loongson-eiointc: Add explicit include for cpuhotplug.h

Removing the include of cpu.h from of_device.h causes an error:

drivers/irqchip/irq-loongson-eiointc.c:420:9: error: implicit declaration of function 'cpuhp_setup_state_nocalls' [-Werror=implicit-function-declaration]

This driver doesn't even use DT, so all the DT includes can be dropped.

Link: https://lore.kernel.org/r/20230329-dt-cpu-header-cleanups-v1-17-581e2605fe47@kernel.orgSigned-off-by: Rob Herring <robh@kernel.org>

drivers/irqchip/irq-loongson-eiointc.c

@@ -7,16 +7,13 @@
 
 #define pr_fmt(fmt) "eiointc: " fmt
 
+#include <linux/cpuhotplug.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <linux/irqchip.h>
 #include <linux/irqdomain.h>
 #include <linux/irqchip/chained_irq.h>
 #include <linux/kernel.h>
-#include <linux/platform_device.h>
-#include <linux/of_address.h>
-#include <linux/of_irq.h>
-#include <linux/of_platform.h>
 #include <linux/syscore_ops.h>
 
 #define EIOINTC_REG_NODEMAP	0x14a0