Pass annotation processors to kotlinc

Enable the kotlin-annotation-processing plugin and pass annotation
processors to it.

Bug: 122251693
Test: m checkbuild
Test: TestKapt in kotlin_test.go
Change-Id: I841df454beaaa7edd263eea714ca0d958a03c9de
diff --git a/java/dex.go b/java/dex.go
index a6d486a..2531970 100644
--- a/java/dex.go
+++ b/java/dex.go
@@ -85,8 +85,8 @@
 func (j *Module) d8Flags(ctx android.ModuleContext, flags javaBuilderFlags) ([]string, android.Paths) {
 	d8Flags := j.dexCommonFlags(ctx)
 
-	d8Flags = append(d8Flags, flags.bootClasspath.FormTurbineClasspath("--lib")...)
-	d8Flags = append(d8Flags, flags.classpath.FormTurbineClasspath("--lib")...)
+	d8Flags = append(d8Flags, flags.bootClasspath.FormTurbineClasspath("--lib ")...)
+	d8Flags = append(d8Flags, flags.classpath.FormTurbineClasspath("--lib ")...)
 
 	var d8Deps android.Paths
 	d8Deps = append(d8Deps, flags.bootClasspath...)