[MIPS] MT: MIPS_MT_SMTC_INSTANT_REPLAY currently conflicts with PREEMPT.

So until MIPS_MT_SMTC_INSTANT_REPLAY has been rewritten to solve this
issue, don't allow selecting it with PREEMPT.
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

arch/mips/Kconfig

@@ -1606,7 +1606,7 @@ config MIPS_MT_FPAFF
 
 config MIPS_MT_SMTC_INSTANT_REPLAY
 	bool "Low-latency Dispatch of Deferred SMTC IPIs"
-	depends on MIPS_MT_SMTC
+	depends on MIPS_MT_SMTC && !PREEMPT
 	default y
 	help
 	  SMTC pseudo-interrupts between TCs are deferred and queued