kconfig: include kernel/Kconfig.preempt from init/Kconfig

Almost all architectures include it.  Add a ARCH_NO_PREEMPT symbol to
disable preempt support for alpha, hexagon, non-coldfire m68k and
user mode Linux.

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

arch/arc/Kconfig

@@ -545,8 +545,6 @@ config ARC_BUILTIN_DTB_NAME
 	  Set the name of the DTB to embed in the vmlinux binary
 	  Leaving it blank selects the minimal "skeleton" dtb
 
-source "kernel/Kconfig.preempt"
-
 endmenu	 # "ARC Architecture Configuration"
 
 config FORCE_MAX_ZONEORDER