selftests: vm: add fragment CONFIG_TEST_VMALLOC

When running test_vmalloc.sh smoke the following print out states that
the fragment is missing.

 # ./test_vmalloc.sh: You must have the following enabled in your kernel:
 # CONFIG_TEST_VMALLOC=m

Rework to add the fragment 'CONFIG_TEST_VMALLOC=m' to the config file.

Link: http://lkml.kernel.org/r/[email protected]
Fixes: a05ef00 ("selftests/vm: add script helper for CONFIG_TEST_VMALLOC_MODULE")
Signed-off-by: Anders Roxell <[email protected]>
Cc: Shuah Khan <[email protected]>
Cc: "Uladzislau Rezki (Sony)" <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

Author: roxell

tools/testing/selftests/vm/config

@@ -1,2 +1,3 @@
 CONFIG_SYSVIPC=y
 CONFIG_USERFAULTFD=y
+CONFIG_TEST_VMALLOC=m