Do not build lsdump for APEX variants

This commit stops building lsdump files for APEX variants since APEX
variants are local to APEX modules themselves.

Bug: 121986692
Test: make findlsdumps  # compare $ANDROID_PRODUCT_OUT/lsdump_paths.txt
Change-Id: I37fcd152d0d84d235a354ea53e53e808dd71464a

cc/cc.go

@@ -634,6 +634,10 @@ func (ctx *moduleContextImpl) shouldCreateVndkSourceAbiDump() bool {
 		// Host modules do not need ABI dumps.
 		return false
 	}
+	if !ctx.mod.IsForPlatform() {
+		// APEX variants do not need ABI dumps.
+		return false
+	}
 	if inList(ctx.baseModuleName(), llndkLibraries) {
 		return true
 	}