x86: thread_info: merge TIF_ flags.

Both TIF lists are essentially the same. x86_32 also has TIF_SYSCALL_EMU which
must be undefined for the 64 bit case.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>