Drop llshell

This feature has not been used and was never fully integrated.
In the progress of cleaning up coreboot, let's drop it.

Change-Id: Ib40acdba30aef00a4a162f2b1009bf8b7db58bbb
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/3251
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

src/Kconfig

@@ -930,14 +930,6 @@ config DEBUG_INTEL_ME
 	  is present on Intel 6-series chipsets.
 endif
 
-config LLSHELL
-	bool "Built-in low-level shell"
-	default n
-	help
-	  If enabled, you will have a low level shell to examine your machine.
-	  Put llshell() in your (romstage) code to start the shell.
-	  See src/arch/x86/llshell/llshell.inc for details.
-
 config TRACE
 	bool "Trace function calls"
 	default n