msmcobalt: use SRC_MEDIA_HAL_DIR to get headers

Bug: 31420007
Change-Id: I5c9f192454c5ed57485ec8d369bcffd0d2ccd534
diff --git a/msmcobalt/QCamera2/Android.mk b/msmcobalt/QCamera2/Android.mk
index 04a935d..2ea388b 100644
--- a/msmcobalt/QCamera2/Android.mk
+++ b/msmcobalt/QCamera2/Android.mk
@@ -82,8 +82,8 @@
         $(LOCAL_PATH)/util \
         $(LOCAL_PATH)/HAL3 \
         hardware/libhardware/include/hardware \
-        hardware/qcom/media/libstagefrighthw \
-        hardware/qcom/media/mm-core/inc \
+        $(SRC_MEDIA_HAL_DIR)/libstagefrighthw \
+        $(SRC_MEDIA_HAL_DIR)/mm-core/inc \
         system/core/include/cutils \
         system/core/include/system \
         system/media/camera/include/system