api: Drop controller_util.PackageInfoToCpv.

Convert remaining usages of PackageInfoToCpv to
deserialize_package_info to allow dropping the SplitCPV usage.

BUG=b:187792048
TEST=run_tests, CQ

Change-Id: I90f48ce1d728bc077dbb6dac1807cb4468f0a8f5
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/chromite/+/4548373
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Alex Klein <saklein@chromium.org>
Auto-Submit: Alex Klein <saklein@chromium.org>
diff --git a/api/controller/dependency.py b/api/controller/dependency.py
index 903399c..aef73c0 100644
--- a/api/controller/dependency.py
+++ b/api/controller/dependency.py
@@ -81,7 +81,8 @@
         sysroot_path = build_target_lib.get_default_sysroot_path(board or None)
 
     packages = tuple(
-        controller_util.PackageInfoToCPV(x) for x in input_proto.packages
+        controller_util.deserialize_package_info(x)
+        for x in input_proto.packages
     )
 
     json_map, sdk_json_map = dependency.GetBuildDependency(