Config: PREEMPT_STATE_TRACE depends on DEBUG_KERNEL.

This patch makes CONFIG_PREEMPT_STATE_TRACE depend on
CONFIG_DEBUG_KERNEL. Prior to this patch, selecting PREEMPT_STATE_TRACE
resulted in linker errors (see below), because sched_state_name is not
built unless DEBUG_KERNEL is selected.

kernel/built-in.o: In function `schedule':
(.sched.text+0x3d2): undefined reference to `sched_state_name'

1 files changed, 1 insertions, 1 deletions

diff --git a/litmus/Kconfig b/litmus/Kconfig
index f2dbfb396883..bd6635c8de08 100644
--- a/litmus/Kconfig
+++ b/litmus/Kconfig
@@ -265,7 +265,7 @@ config SCHED_DEBUG_TRACE_CALLER
 
 config PREEMPT_STATE_TRACE
        bool "Trace preemption state machine transitions"
-       depends on SCHED_DEBUG_TRACE
+       depends on SCHED_DEBUG_TRACE && DEBUG_KERNEL
        default n
        help
          With this option enabled, each CPU will log when it transitions