Add TARGET_SLSI_VARIANT makefile guard

Change-Id: I3df35a154d6f7bb9bad355a7ea4ad417780c5506
diff --git a/Android.mk b/Android.mk
index 28dda55..49a691e 100644
--- a/Android.mk
+++ b/Android.mk
@@ -14,9 +14,11 @@
 # limitations under the License.
 #
 
+ifeq ($(TARGET_SLSI_VARIANT),linaro)
 ifeq ($(TARGET_SOC_BASE), exynos9830)
 interfaces_dirs := \
 	libGeoTrans/1.0
 
 include $(call all-named-subdir-makefiles,$(interfaces_dirs))
 endif
+endif