sm6225-common: Declare shipping API level

Now we have Redmi 15 4G / Poco M7 4G (creek), where PRODUCT_SHIPPING_API_LEVEL := 35
Make this value as device-specific thing.

Change-Id: I1d5c5599d65aca93b1c32bfef4ada3ccb8145d6c
diff --git a/common.mk b/common.mk
index 4f49cea..d82f363 100644
--- a/common.mk
+++ b/common.mk
@@ -19,5 +19,8 @@
 # A/B
 $(call inherit-product, $(SRC_TARGET_DIR)/product/virtual_ab_ota/launch_with_vendor_ramdisk.mk)
 
+# Shipping API Level
+BOARD_SHIPPING_API_LEVEL := 33
+
 # Inherit from vendor blobs
 $(call inherit-product, vendor/xiaomi/sm6225-common/sm6225-common-vendor.mk)