Pass DepsContext to dependency methods

Pass a DepsContext that embeds android.BottomUpMutatorContext
instead of android.BaseContext so that dependency methods can
directly add dependencies.

Test: m -j
Change-Id: Id4c157975d3d6f03efd99785d217bef486a76139
diff --git a/cc/object.go b/cc/object.go
index 16ed455..eaddd89 100644
--- a/cc/object.go
+++ b/cc/object.go
@@ -54,7 +54,7 @@
 
 func (*objectLinker) linkerInit(ctx BaseModuleContext) {}
 
-func (object *objectLinker) linkerDeps(ctx BaseModuleContext, deps Deps) Deps {
+func (object *objectLinker) linkerDeps(ctx DepsContext, deps Deps) Deps {
 	deps.ObjFiles = append(deps.ObjFiles, object.Properties.Objs...)
 	return deps
 }