xtensa: disable hanging mmap2 test on noMMU

test/mmap/Makefile.in

@@ -4,3 +4,7 @@
 ifeq ($(TARGET_ARCH),arm)
 TESTS_DISABLED := mmap2
 endif
+
+ifeq ($(TARGET_ARCH),xtensa)
+TESTS_DISABLED := mmap2
+endif