Add BT product namespaces to gsi_arm64.mk.

Add these namespaces is required to build gsi_arm64 in Keystone.

Test: python3 vendor/google_keystone/build_local.py --build_target
gsi_arm64
Bug: 181059475

Change-Id: I76b884eaa6049c53e83d2a27506d2e5b2e079c45
diff --git a/gsi_arm64.mk b/gsi_arm64.mk
index 53c8300..21216e3 100644
--- a/gsi_arm64.mk
+++ b/gsi_arm64.mk
@@ -50,6 +50,12 @@
 #
 $(call inherit-product, $(SRC_TARGET_DIR)/product/gsi_release.mk)
 
+#
+# The Bluetooth namespace needs to be selected to include the default
+# Bluetooth implementation
+#
+PRODUCT_SOONG_NAMESPACES += packages/apps/Bluetooth
+PRODUCT_SOONG_NAMESPACES += vendor/qcom/opensource/commonsys/system/bt/conf
 
 PRODUCT_NAME := gsi_arm64
 PRODUCT_DEVICE := generic_arm64