添加rtthread相关代码

riscv/rtthread/components/drivers/pic/Kconfig

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+menuconfig RT_USING_PIC
+    bool "Using Programmable Interrupt Controller (PIC)"
+    select RT_USING_BITMAP
+    depends on RT_USING_DM
+    default n
+
+config MAX_HANDLERS
+    int "IRQ max handlers"
+    depends on RT_USING_PIC
+    range 1 4294967294
+    default 256
+
+config RT_PIC_ARM_GIC
+    bool "ARM GICv2/v1"
+    depends on RT_USING_PIC
+    select RT_USING_OFW
+    default n
+
+config RT_PIC_ARM_GIC_V3
+    bool "ARM GICv3"
+    depends on RT_USING_PIC
+    select RT_USING_OFW
+    default n
+
+config RT_PIC_ARM_GIC_MAX_NR
+    int
+    depends on RT_USING_PIC
+    depends on RT_PIC_ARM_GIC
+    default 2 if SOC_REALVIEW
+    default 1