csky/Kconfig: Add Kconfig.platforms to support some drivers

Such as snps,dw-apb-ictl

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
diff --git a/arch/csky/Kconfig b/arch/csky/Kconfig
index 00ac7bc..1c723cb 100644
--- a/arch/csky/Kconfig
+++ b/arch/csky/Kconfig
@@ -270,4 +270,6 @@
 	  Say N if you want to disable CPU hotplug.
 endmenu
 
+source "arch/csky/Kconfig.platforms"
+
 source "kernel/Kconfig.hz"
diff --git a/arch/csky/Kconfig.platforms b/arch/csky/Kconfig.platforms
new file mode 100644
index 0000000..639e17f
--- /dev/null
+++ b/arch/csky/Kconfig.platforms
@@ -0,0 +1,9 @@
+menu "Platform drivers selection"
+
+config ARCH_CSKY_DW_APB_ICTL
+	bool "Select dw-apb interrupt controller"
+	select DW_APB_ICTL
+	default y
+	help
+	  This enables support for snps dw-apb-ictl
+endmenu