vexpress-a9: Set TARGET_EXTRA_CFLAGS to optimise for A9

Change-Id: If05fa985932d548f2638a5a71cf5c77b7d196242
Signed-off-by: Jon Medhurst <tixy@linaro.org>
diff --git a/BoardConfig.mk b/BoardConfig.mk
index 27bf57a..3637c41 100644
--- a/BoardConfig.mk
+++ b/BoardConfig.mk
@@ -37,7 +37,7 @@
 
 # Dual-Core Cortex A9
 TARGET_CPU_SMP := true
-#TARGET_EXTRA_CFLAGS += -mtune=cortex-a9 -mcpu=cortex-a9
+TARGET_EXTRA_CFLAGS += $(call cc-option,-mtune=cortex-a9,$(call cc-option,-mtune=cortex-a8)) $(call cc-option,-mcpu=cortex-a9,$(call cc-option,-mcpu=cortex-a8))
 
 # ARMs gator (DS-5)
 TARGET_USE_GATOR:= true
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