Blackfin: drop unused cache flush code

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/cpu/blackfin/Makefile b/cpu/blackfin/Makefile
index f194a38..8fed4b4 100644
--- a/cpu/blackfin/Makefile
+++ b/cpu/blackfin/Makefile
@@ -16,7 +16,7 @@
 EXTRA    :=
 CEXTRA   := initcode.o
 SEXTRA   := start.o
-SOBJS    := interrupt.o cache.o flush.o
+SOBJS    := interrupt.o cache.o
 COBJS    := cpu.o traps.o interrupts.o reset.o serial.o i2c.o watchdog.o
 
 ifeq ($(CONFIG_BFIN_BOOT_MODE),BFIN_BOOT_BYPASS)