cris: make ETRAX_ARCH_V10 select TTY for use in debugport

Fix breakage which will be exposed by the patch "kconfig: make allnoconfig
disable options behind EMBEDDED and EXPERT".

arch/cris/arch-v10/kernel/debugport.c, compiled in unconditionally with
ETRAX_ARCH_V10, requires TTY, so select TTY to avoid a build failure.
Signed-off-by: Josh Triplett <josh@joshtriplett.org>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Mikael Starvik <starvik@axis.com>
Cc: Jesper Nilsson <jesper.nilsson@axis.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/cris/Kconfig

@@ -138,6 +138,7 @@ config ETRAX_ARCH_V10
        bool
        default y if ETRAX100LX || ETRAX100LX_V2
        default n if !(ETRAX100LX || ETRAX100LX_V2)
+       select TTY
 
 config ETRAX_ARCH_V32
        bool