Blackfin arch: do not allow L2 to be cached on BF561 SMP

Signed-off-by: Bryan Wu <cooloney@kernel.org>

arch/blackfin/Kconfig

@@ -866,7 +866,7 @@ endchoice
 
 config BFIN_L2_CACHEABLE
 	bool "Cache L2 SRAM"
-	depends on (BFIN_DCACHE || BFIN_ICACHE) && (BF54x || BF561)
+	depends on (BFIN_DCACHE || BFIN_ICACHE) && (BF54x || (BF561 && !SMP))
 	default n
 	help
 	  Select to make L2 SRAM cacheable in L1 data and instruction cache.