sm6225-common: Import `hardware/xiaomi` namespace

Change-Id: I9aca52286bcf8dd2efad42245dfff36cda02c24e
diff --git a/Android.bp b/Android.bp
index cdaa513..61162c9 100644
--- a/Android.bp
+++ b/Android.bp
@@ -5,4 +5,7 @@
 //
 
 soong_namespace {
+    imports: [
+        "hardware/xiaomi",
+    ],
 }
diff --git a/common.mk b/common.mk
index 15c5234..5caf0e1 100644
--- a/common.mk
+++ b/common.mk
@@ -65,7 +65,8 @@
 
 # Soong namespaces
 PRODUCT_SOONG_NAMESPACES += \
-    $(LOCAL_PATH)
+    $(LOCAL_PATH) \
+    hardware/xiaomi
 
 # Update engine
 PRODUCT_PACKAGES += \
diff --git a/extract-files.py b/extract-files.py
index 93b821b..fdbbfc2 100755
--- a/extract-files.py
+++ b/extract-files.py
@@ -20,6 +20,7 @@
 
 namespace_imports = [
     'device/xiaomi/sm6225-common',
+    'hardware/xiaomi',
 ]