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

Such as snps,dw-apb-ictl
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>

arch/csky/Kconfig

@@ -270,4 +270,6 @@ config HOTPLUG_CPU
 	  Say N if you want to disable CPU hotplug.
 endmenu
 
+source "arch/csky/Kconfig.platforms"
+
 source "kernel/Kconfig.hz"

arch/csky/Kconfig.platforms

+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