kconfig: include common Kconfig files from top-level Kconfig

Instead of duplicating the source statements in every architecture just
do it once in the toplevel Kconfig file.

Note that with this the inclusion of arch/$(SRCARCH/Kconfig moves out of
the top-level Kconfig into arch/Kconfig so that don't violate ordering
constraits while keeping a sensible menu structure.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

arch/um/Kconfig

@@ -75,8 +75,6 @@ config STATIC_LINK
 	  Additionally, this option enables using higher memory spaces (up to
 	  2.75G) for UML.
 
-source "mm/Kconfig"
-
 config LD_SCRIPT_STATIC
 	bool
 	default y
@@ -88,8 +86,6 @@ config LD_SCRIPT_DYN
 	depends on !LD_SCRIPT_STATIC
         select MODULE_REL_CRCS if MODVERSIONS
 
-source "fs/Kconfig.binfmt"
-
 config HOSTFS
 	tristate "Host filesystem"
 	help
@@ -190,22 +186,6 @@ config SECCOMP
 
 endmenu
 
-source "init/Kconfig"
-
-source "kernel/Kconfig.freezer"
-
 source "arch/um/drivers/Kconfig"
 
-source "drivers/Kconfig"
-
-source "net/Kconfig"
-
-source "fs/Kconfig"
-
-source "security/Kconfig"
-
-source "crypto/Kconfig"
-
-source "lib/Kconfig"
-
 source "arch/um/Kconfig.debug"