Revise API reference generator for DevSite-based DAC

This CL updates the RenderScript API references generator so that
DevSite headers are generated, and the driving generate.sh now places the
generated files in a Piper client, assuming DevSite-based DAC directory
structure.

Also removed support for verification (i.e. -H) as it is no longer used.

Bug: 62802398
Test: run generate.sh given a Piper client
Test: g4 diff between generated API reference files and the DAC version
Change-Id: Ie9bc7ef5a2cc58f17d07d86872220fa9d2dde213
diff --git a/script_api/Specification.cpp b/script_api/Specification.cpp
index f7d139e..4082a04 100644
--- a/script_api/Specification.cpp
+++ b/script_api/Specification.cpp
@@ -932,9 +932,9 @@
     return maxApiLevel;
 }
 
-bool SystemSpecification::generateFiles(bool forVerification, unsigned int maxApiLevel) const {
+bool SystemSpecification::generateFiles(unsigned int maxApiLevel) const {
     bool success = generateHeaderFiles("include") &&
-                   generateDocumentation("docs", forVerification) &&
+                   generateDocumentation("docs") &&
                    generateTestFiles("test", maxApiLevel) &&
                    generateStubsWhiteList("slangtest", maxApiLevel);
     if (success) {