ltp-testsuite: bump version and other fixes

This commit bumps ltp-testsuite to the latest version available. In
addition to that, it also:

 * Removes the ltp-testsuite-disable-controllers.patch file, which
   becomes useless thanks to the workaround that consists in removing
   -D_FILE_OFFSET_BITS=64 from the CFLAGS. This is necessary because
   ltp-testsuite uses the non-largefile compatible <fts.h> interface.

 * Marks the package as not-available on AArch64, since it doesn't
   build properly. A bug has been submitted upstream to the Linaro
   people doing the AArch64 support.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>