trusty: Add trusty_metrics_atoms_protoc_plugin

Needed by trusty build. Add here to simplify chained builds.

Ignore-AOSP-First: AOSP is locked down
Test: m && trusty/vendor/google/aosp/scripts/build.py qemu-generic-arm64-gicv3-test-debug --skip-tests
Change-Id: I66f571954f46e92600eba190d654e6741c7edaaa
diff --git a/qemu_trusty_base.mk b/qemu_trusty_base.mk
index 4c2a748..9e31b33 100644
--- a/qemu_trusty_base.mk
+++ b/qemu_trusty_base.mk
@@ -134,6 +134,7 @@
     mke2fs \
     sload_f2fs \
     toybox \
+    trusty_metrics_atoms_protoc_plugin \
 
 PRODUCT_PACKAGES += init.usb.rc init.usb.configfs.rc