kconfig: use a menu in arch/Kconfig to reduce clutter

Put everything in arch/Kconfig into a General options menu
so that they don't clutter up the main/major/primary list of
menu options.
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

arch/Kconfig

@@ -9,6 +9,8 @@
 #
 source "arch/$(SRCARCH)/Kconfig"
 
+menu "General architecture-dependent options"
+
 config CRASH_CORE
 	bool
 
@@ -981,3 +983,5 @@ config REFCOUNT_FULL
 	  security flaw exploits.
 
 source "kernel/gcov/Kconfig"
+
+endmenu