sched/rt, microblaze: Use CONFIG_PREEMPTION

CONFIG_PREEMPTION is selected by CONFIG_PREEMPT and by CONFIG_PREEMPT_RT.
Both PREEMPT and PREEMPT_RT require the same functionality which today
depends on CONFIG_PREEMPT.

Switch the entry code over to use CONFIG_PREEMPTION.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20191015191821.11479-12-bigeasy@linutronix.deSigned-off-by: Ingo Molnar <mingo@kernel.org>

arch/microblaze/kernel/entry.S

@@ -728,7 +728,7 @@ no_intr_resched:
 	bri	6f;
 /* MS: Return to kernel state. */
 2:
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 	lwi	r11, CURRENT_TASK, TS_THREAD_INFO;
 	/* MS: get preempt_count from thread info */
 	lwi	r5, r11, TI_PREEMPT_COUNT;