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/toolchain_library.go b/cc/toolchain_library.go
index 6ca9dc3..1bbe774 100644
--- a/cc/toolchain_library.go
+++ b/cc/toolchain_library.go
@@ -33,7 +33,7 @@
 	*libraryDecorator
 }
 
-func (*toolchainLibraryDecorator) linkerDeps(ctx BaseModuleContext, deps Deps) Deps {
+func (*toolchainLibraryDecorator) linkerDeps(ctx DepsContext, deps Deps) Deps {
 	// toolchain libraries can't have any dependencies
 	return deps
 }