Add property to apex soong modules to generate an APEX without hashtree

This will help testing on-device hashtree generation.

Test: see other CL in topic
Bug: 145670581
Change-Id: I96b1b2392302aed8a6e80ed52de2d057a532a288
diff --git a/apex/apex.go b/apex/apex.go
index 3dde149..81c1230 100644
--- a/apex/apex.go
+++ b/apex/apex.go
@@ -339,6 +339,10 @@
 	// binaries would be installed by default (in PRODUCT_PACKAGES) the other binary will be removed
 	// from PRODUCT_PACKAGES.
 	Overrides []string
+
+	// Whenever apex_payload.img of the APEX should include dm-verity hashtree.
+	// Should be only used in tests#.
+	Test_only_no_hashtree *bool
 }
 
 type apexTargetBundleProperties struct {
@@ -731,6 +735,10 @@
 	return !a.properties.PreventInstall && (a.properties.Installable == nil || proptools.Bool(a.properties.Installable))
 }
 
+func (a *apexBundle) testOnlyShouldSkipHashtreeGeneration() bool {
+	return proptools.Bool(a.properties.Test_only_no_hashtree)
+}
+
 func (a *apexBundle) getImageVariation(config android.DeviceConfig) string {
 	if a.vndkApex {
 		return cc.VendorVariationPrefix + a.vndkVersion(config)