axolotl: Build GPS HAL from source

Change-Id: I6a17bbd62e8b8016a3bb2f643a3a042619259a8e
diff --git a/BoardConfig.mk b/BoardConfig.mk
index f7f3d89..3ff1e8a 100644
--- a/BoardConfig.mk
+++ b/BoardConfig.mk
@@ -141,6 +141,10 @@
 # Filesystem
 TARGET_FS_CONFIG_GEN := $(DEVICE_PATH)/rootdir/config.fs
 
+# GPS
+BOARD_VENDOR_QCOM_GPS_LOC_API_HARDWARE := default
+LOC_HIDL_VERSION := 3.0
+
 # Graphics
 TARGET_USES_GRALLOC1 := true
 TARGET_USES_HWC2 := true