Have ConvertWBp2build use Bp2buildMutatorContext

This no-op refactoring facilitates some upcoming functional changes for
"bp2build allowlist v2". The work requires that the bp2build conversion
mutator be changed from a TopDown mutator to a BottomUp mutator.
Refactoring all bp2build-related methods so that they use Bp2buildMutatorContext
makes it easier to make this functional change without touching tens of
files and multiple projects.

Bug: 285631638
Test: m bp2build
Change-Id: I3d1ef3064146e959c6f0dc315350fc9764bf2bd2
diff --git a/java/platform_compat_config.go b/java/platform_compat_config.go
index 1248275..662a2d7 100644
--- a/java/platform_compat_config.go
+++ b/java/platform_compat_config.go
@@ -130,7 +130,7 @@
 	Src bazel.LabelAttribute
 }
 
-func (p *platformCompatConfig) ConvertWithBp2build(ctx android.TopDownMutatorContext) {
+func (p *platformCompatConfig) ConvertWithBp2build(ctx android.Bp2buildMutatorContext) {
 	props := bazel.BazelTargetModuleProperties{
 		Rule_class:        "platform_compat_config",
 		Bzl_load_location: "//build/bazel/rules/java:platform_compat_config.bzl",