Add vendor snapshot modules

This implements four modules (static/shared/header libraries, and
binaries) for vendor snapshot. These modules will override source
modules if BOARD_VNDK_VERSION != current.

Bug: 65377115
Test: 1) VNDK_SNAPSHOT_BUILD_ARTIFACTS=true m dist vndk vendor-snapshot
Test: 2) install snapshot under source tree
Test: 3) set BOARD_VNDK_VERSION and boot cuttlefish
Change-Id: I24ddb4c3aa6abeab60bbfd31bcbd8753e2592dc5

android/arch.go

@@ -765,7 +765,7 @@ func osMutator(mctx BottomUpMutatorContext) {
 	}
 
 	if len(moduleOSList) == 0 {
-		base.commonProperties.Enabled = boolPtr(false)
+		base.Disable()
 		return
 	}
 
@@ -869,7 +869,7 @@ func archMutator(mctx BottomUpMutatorContext) {
 	}
 
 	if len(targets) == 0 {
-		base.commonProperties.Enabled = boolPtr(false)
+		base.Disable()
 		return
 	}