cache: enable L2 sram icache in menuconfig

Signed-off-by: Steven Miao <realmz6@gmail.com>
Signed-off-by: Bob Liu <lliubbo@gmail.com>

arch/blackfin/Kconfig

@@ -1050,7 +1050,7 @@ config BFIN_EXTMEM_ICACHEABLE
 config BFIN_L2_ICACHEABLE
 	bool "Enable ICACHE for L2 SRAM"
 	depends on BFIN_ICACHE
-	depends on BF54x || BF561
+	depends on (BF54x || BF561 || BF60x) && !SMP
 	default n
 
 config BFIN_DCACHE