sched/rt, hexagon: 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: Brian Cain <bcain@codeaurora.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: linux-hexagon@vger.kernel.org
Link: https://lore.kernel.org/r/20191015191821.11479-9-bigeasy@linutronix.deSigned-off-by: Ingo Molnar <mingo@kernel.org>

arch/hexagon/kernel/vm_entry.S

@@ -265,12 +265,12 @@ event_dispatch:
 	 * should be in the designated register (usually R19)
 	 *
 	 * If we were in kernel mode, we don't need to check scheduler
-	 * or signals if CONFIG_PREEMPT is not set.  If set, then it has
+	 * or signals if CONFIG_PREEMPTION is not set.  If set, then it has
 	 * to jump to a need_resched kind of block.
-	 * BTW, CONFIG_PREEMPT is not supported yet.
+	 * BTW, CONFIG_PREEMPTION is not supported yet.
 	 */
 
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 	R0 = #VM_INT_DISABLE
 	trap1(#HVM_TRAP1_VMSETIE)
 #endif