Remove references to SourceDepTag in module types

SourceDepTag is going to become a set of tags of the same type
instead of a single tag, remove references to it outside the
android module.

Bug: 80144045
Test: soong tests
Change-Id: I00b2ea5040e4fc95dfbfdd79e21579853c478fcb

genrule/genrule.go

@@ -163,8 +163,6 @@ func (g *Module) GenerateAndroidBuildActions(ctx android.ModuleContext) {
 	if len(g.properties.Tools) > 0 {
 		ctx.VisitDirectDepsBlueprint(func(module blueprint.Module) {
 			switch ctx.OtherModuleDependencyTag(module) {
-			case android.SourceDepTag:
-				// Nothing to do
 			case hostToolDepTag:
 				tool := ctx.OtherModuleName(module)
 				var path android.OptionalPath
@@ -201,8 +199,6 @@ func (g *Module) GenerateAndroidBuildActions(ctx android.ModuleContext) {
 				} else {
 					ctx.ModuleErrorf("host tool %q missing output file", tool)
 				}
-			default:
-				ctx.ModuleErrorf("unknown dependency on %q", ctx.OtherModuleName(module))
 			}
 		})
 	}