x86_64: Quieten Atari keyboard warnings in Kconfig

Not directly related to x86, but I got tired of seeing these warnings on every
kconfig update when building on a non m68k box:

drivers/input/keyboard/Kconfig:170:warning: 'select' used by config symbol 'KEYBOARD_ATARI' refers to undefined symbol 'ATARI_KBD_CORE'
drivers/input/mouse/Kconfig:182:warning: 'select' used by config symbol 'MOUSE_ATARI' refers to undefined symbol 'ATARI_KBD_CORE'

I moved the definition of ATARI_KBD_CORE into drivers/input/keyboard/Kconfig
so it's always seen by Kconfig.

Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: NRoman Zippel <zippel@linux-m68k.org>
Signed-off-by: NAndi Kleen <ak@suse.de>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

arch/m68k/Kconfig

@@ -418,9 +418,6 @@ config STRAM_PROC
 	help
 	  Say Y here to report ST-RAM usage statistics in /proc/stram.
 
-config ATARI_KBD_CORE
-	bool
-
 config HEARTBEAT
 	bool "Use power LED as a heartbeat" if AMIGA || APOLLO || ATARI || MAC ||Q40
 	default y if !AMIGA && !APOLLO && !ATARI && !MAC && !Q40 && HP300

drivers/input/keyboard/Kconfig

@@ -164,6 +164,9 @@ config KEYBOARD_AMIGA
 	  To compile this driver as a module, choose M here: the
 	  module will be called amikbd.
 
+config ATARI_KBD_CORE
+	bool
+
 config KEYBOARD_ATARI
 	tristate "Atari keyboard"
 	depends on ATARI