Generate rules.mk for der via cargo_embargo

Update cargo_embargo.json to also generate Trusty rules.mk for use
in the Trusty kernel.

Test: cargo_embargo generate cargo_embargo.json
Change-Id: I499e43b38354c243796e90820e56b60721711752
diff --git a/crates/der/cargo_embargo.json b/crates/der/cargo_embargo.json
index ca989f0..60ff186 100644
--- a/crates/der/cargo_embargo.json
+++ b/crates/der/cargo_embargo.json
@@ -36,6 +36,10 @@
           "no_std": true
         }
       }
+    },
+    {
+      "generate_androidbp": false,
+      "generate_rulesmk": true
     }
   ]
 }
diff --git a/crates/der/rules.mk b/crates/der/rules.mk
index f5d264e..160ae95 100644
--- a/crates/der/rules.mk
+++ b/crates/der/rules.mk
@@ -1,24 +1,25 @@
-# This file is generated by cargo2rulesmk.py --run --config cargo2rulesmk.json.
-# Do not modify this file as changes will be overridden on upgrade.
+# This file is generated by cargo_embargo.
+# Do not modify this file after the LOCAL_DIR line
+# because the changes will be overridden on upgrade.
+# Content before the first line starting with LOCAL_DIR is preserved.
 
 LOCAL_DIR := $(GET_LOCAL_DIR)
 MODULE := $(LOCAL_DIR)
 MODULE_CRATE_NAME := der
-MODULE_SRCS := \
-	$(LOCAL_DIR)/src/lib.rs \
-
+MODULE_RUST_CRATE_TYPES := rlib
+MODULE_SRCS := $(LOCAL_DIR)/src/lib.rs
 MODULE_RUST_EDITION := 2021
 MODULE_RUSTFLAGS += \
 	--cfg 'feature="alloc"' \
 	--cfg 'feature="derive"' \
 	--cfg 'feature="flagset"' \
 	--cfg 'feature="oid"' \
-	--cfg 'feature="zeroize"' \
+	--cfg 'feature="zeroize"'
 
 MODULE_LIBRARY_DEPS := \
-	external/rust/crates/const-oid \
-	external/rust/crates/der_derive \
-	external/rust/crates/flagset \
-	external/rust/crates/zeroize \
+	$(call FIND_CRATE,const-oid) \
+	$(call FIND_CRATE,der_derive) \
+	$(call FIND_CRATE,flagset) \
+	$(call FIND_CRATE,zeroize)
 
 include make/library.mk