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/nds32/Kconfig

@@ -88,6 +88,5 @@ config NDS32_BUILTIN_DTB
 endmenu
 
 menu "Kernel Features"
-source "kernel/Kconfig.preempt"
 source "kernel/Kconfig.hz"
 endmenu