powerpc/kexec: Enable SMT before waking offline CPUs

powerpc/kexec: Enable SMT before waking offline CPUs

If SMT is disabled or a partial SMT state is enabled, when a new kernel
image is loaded for kexec, on reboot the following warning is observed:

kexec: Waking offline cpu 228.
WARNING: CPU: 0 PID: 9062 at arch/powerpc/kexec/core_64.c:223 kexec_prepare_cpus+0x1b0/0x1bc
[snip]
 NIP kexec_prepare_cpus+0x1b0/0x1bc
 LR  kexec_prepare_cpus+0x1a0/0x1bc
 Call Trace:
  kexec_prepare_cpus+0x1a0/0x1bc (unreliable)
  default_machine_kexec+0x160/0x19c
  machine_kexec+0x80/0x88
  kernel_kexec+0xd0/0x118
  __do_sys_reboot+0x210/0x2c4
  system_call_exception+0x124/0x320
  system_call_vectored_common+0x15c/0x2ec

This occurs as add_cpu() fails due to cpu_bootable() returning false for
CPUs that fail the cpu_smt_thread_allowed() check or non primary
threads if SMT is disabled.

Fix the issue by enabling SMT and resetting the number of SMT threads to
the number of threads per core, before attempting to wake up all present
CPUs.

Fixes: 38253464bc82 ("cpu/SMT: Create topology_smt_thread_allowed()")
Reported-by: Sachin P Bappalige <sachinpb@linux.ibm.com>
Cc: stable@vger.kernel.org # v6.6+
Reviewed-by: Srikar Dronamraju <srikar@linux.ibm.com>
Signed-off-by: Nysal Jan K.A. <nysal@linux.ibm.com>
Tested-by: Samir M <samir@linux.ibm.com>
Reviewed-by: Sourabh Jain <sourabhjain@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20251028105516.26258-1-nysal@linux.ibm.com