We had hardcoded defines for TI_TASK TI_EXEC_DOMAIN, TI_FLAGS, TI_CPU,
TI_ADDR_LIMIT, TI_PRE_COUNT, TI_RESTART_BLOCK; but only two of these
were ever used.  Remove all from thread_info.h, and generate the two
that we do use (TI_FLAGS and TI_PRE_COUNT) in asm_offsets.c

Patch supplied by Zou Nan hai
Signed-off-by: Tony Luck <tony.luck@intel.com>