arm64: proton-pack: Fix hard lockup due to print in scheduler context

arm64: proton-pack: Fix hard lockup due to print in scheduler context

Relocate the printk() calls from spectre_v4_mitigations_off() and
spectre_v2_mitigations_off() into setup_system_capabilities() function,
preventing hard lockups caused by printk calls in scheduler context:

  | _raw_spin_lock_nested+168
  | ttwu_queue+180 （rq_lock(rq, &rf); 2nd acquiring the rq->__lock）
  | try_to_wake_up+548
  | wake_up_process+32
  | __up+88
  | up+100
  | __up_console_sem+96
  | console_unlock+696
  | vprintk_emit+428
  | vprintk_default+64
  | vprintk_func+220
  | printk+104
  | spectre_v4_enable_task_mitigation+344
  | __switch_to+100
  | __schedule+1028 (rq_lock(rq, &rf); 1st acquiring the rq->__lock)
  | schedule_idle+48
  | do_idle+388
  | cpu_startup_entry+44
  | secondary_start_kernel+352

Suggested-by: Mark Rutland <mark.rutland@arm.com>
Suggested-by: Catalin Marinas <catalin.marinas@arm.com>
Suggested-by: Will Deacon <will@kernel.org>
Signed-off-by: shechenglong <shechenglong@xfusion.com>
Signed-off-by: Will Deacon <will@kernel.org>