Fix the static rule for generating the revert annotations

While the static rule depends on the keep-flagged-apis binary, the
command deps was mistakenly not specified. This change fixes the rule.

Test: m
Change-Id: I4875ac516e0e03389eb6a09d720c94f28710fbc9
diff --git a/java/builder.go b/java/builder.go
index 6919236..e9218a7 100644
--- a/java/builder.go
+++ b/java/builder.go
@@ -287,7 +287,8 @@
 
 	generateMetalavaRevertAnnotationsRule = pctx.AndroidStaticRule("generateMetalavaRevertAnnotationsRule",
 		blueprint.RuleParams{
-			Command: `${keep-flagged-apis} ${in} > ${out}`,
+			Command:     `${keep-flagged-apis} ${in} > ${out}`,
+			CommandDeps: []string{"${keep-flagged-apis}"},
 		})
 )