sm6225-common: Migrate mount point creation out of Android.mk

Change-Id: Id5986b8a740e45f864eecdd2bd82d9455f128d6b
diff --git a/common.mk b/common.mk
index 1cf6206..159ef50 100644
--- a/common.mk
+++ b/common.mk
@@ -17,6 +17,12 @@
 # Inherit the proprietary files
 $(call inherit-product, vendor/xiaomi/sm6225-common/sm6225-common-vendor.mk)
 
+# Partitions
+PRODUCT_PACKAGES += \
+    vendor_bt_firmware_mountpoint \
+    vendor_dsp_mountpoint \
+    vendor_firmware_mnt_mountpoint
+
 # Shipping API Level
 PRODUCT_SHIPPING_API_LEVEL := 33