exynos4: added secril-client and secril-client-sap sources

taken from i9100 update7 and i9300 update4

Change-Id: I1188c8c43c07ff179bc592a22345e4db9d8a56bf
diff --git a/exynos4x12.mk b/exynos4x12.mk
index ae761c4..9c1960e 100644
--- a/exynos4x12.mk
+++ b/exynos4x12.mk
@@ -18,6 +18,7 @@
 include $(TARGET_HAL_PATH)/Android.mk
 include hardware/samsung/exynos/multimedia/Android.mk
 include hardware/samsung/exynos4/exynos4x12/Android.mk
+include hardware/samsung/exynos4/ril/Android.mk
 
 endif
 endif