Remove apex.generate_hashtree

It's deprecated.

Ignore-AOSP-First: internal branches use this. Will be gone.
Fixes: 184914612
Test: m
Change-Id: I14316a9a288ffc2727bb7033ebded4f4d48b1e6c

apex/builder.go

@@ -766,18 +766,6 @@ func (a *apexBundle) buildApex(ctx android.ModuleContext) {
 	implicitInputs = append(implicitInputs, noticeAssetPath)
 	optFlags = append(optFlags, "--assets_dir "+filepath.Dir(noticeAssetPath.String()))
 
-	// Apexes which are supposed to be installed in builtin dirs(/system, etc)
-	// don't need hashtree for activation. Therefore, by removing hashtree from
-	// apex bundle (filesystem image in it, to be specific), we can save storage.
-	needHashTree := moduleMinSdkVersion.LessThanOrEqualTo(android.SdkVersion_Android10) ||
-		a.shouldGenerateHashtree()
-	if ctx.Config().ApexCompressionEnabled() && a.isCompressable() {
-		needHashTree = true
-	}
-	if !needHashTree {
-		optFlags = append(optFlags, "--no_hashtree")
-	}
-
 	if a.testOnlyShouldSkipPayloadSign() {
 		optFlags = append(optFlags, "--unsigned_payload")
 	}