sm8350-common: Migrate to restructured sepolicy_vndr

The new folder structure now looks like this:

  device/qcom/sepolicy_vndr
  ├─ legacy-um (meant for sdm845 until sm8350)
  ├─ sm8450
  └─ sm8550

Change-Id: I4ed1a06af779909d64172da294c4a99a3ae9ba0d

BoardConfigCommon.mk

@@ -175,7 +175,7 @@ ENABLE_VENDOR_RIL_SERVICE := true
 VENDOR_SECURITY_PATCH := 2023-01-01
 
 # Sepolicy
-include device/qcom/sepolicy_vndr-legacy-um/SEPolicy.mk
+include device/qcom/sepolicy_vndr/SEPolicy.mk
 
 SYSTEM_EXT_PRIVATE_SEPOLICY_DIRS += $(COMMON_PATH)/sepolicy/private
 SYSTEM_EXT_PUBLIC_SEPOLICY_DIRS += $(COMMON_PATH)/sepolicy/public