intel_idle: clean up intel_idle_init_cstates_icpu()

The intel_idle_init_cstates_icpu() function includes a loop that iterates
over every C-state. Inside the loop, the same C-state data is referenced 2
ways:
 1. as cpuidle_state_table[cstate]
 2. as drv->states[drv->state_count] (but it is a copy of #1, not the same
    object).

Make the code be more consistent and easier to read by using only the 2nd
way. So the code structure would be as follows:

 1. Use cpuidle_state_table[cstate]
 2. Copy cpuidle_state_table[cstate] to drv->states[drv->state_count]
 3. Use only drv->states[drv->state_count] from this point.

Note, this change introduces a checkpatch.pl warning (too long line), but it
will be addressed in the next patch.

Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Reviewed-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Author: dedekind

drivers/idle/intel_idle.c

@@ -1894,24 +1894,24 @@ static void __init intel_idle_init_cstates_icpu(struct cpuidle_driver *drv)
 		/* Structure copy. */
 		drv->states[drv->state_count] = cpuidle_state_table[cstate];
 
-		if ((cpuidle_state_table[cstate].flags & CPUIDLE_FLAG_IRQ_ENABLE) || force_irq_on) {
+		if ((drv->states[drv->state_count].flags & CPUIDLE_FLAG_IRQ_ENABLE) || force_irq_on) {
 			pr_info("forced intel_idle_irq for state %d\n", cstate);
 			drv->states[drv->state_count].enter = intel_idle_irq;
 		}
 
 		if (cpu_feature_enabled(X86_FEATURE_KERNEL_IBRS) &&
-		    cpuidle_state_table[cstate].flags & CPUIDLE_FLAG_IBRS) {
-			WARN_ON_ONCE(cpuidle_state_table[cstate].flags & CPUIDLE_FLAG_IRQ_ENABLE);
+		    drv->states[drv->state_count].flags & CPUIDLE_FLAG_IBRS) {
+			WARN_ON_ONCE(drv->states[drv->state_count].flags & CPUIDLE_FLAG_IRQ_ENABLE);
 			drv->states[drv->state_count].enter = intel_idle_ibrs;
 		}
 
-		if (cpuidle_state_table[cstate].flags & CPUIDLE_FLAG_INIT_XSTATE)
+		if (drv->states[drv->state_count].flags & CPUIDLE_FLAG_INIT_XSTATE)
 			drv->states[drv->state_count].enter = intel_idle_xstate;
 
 		if ((disabled_states_mask & BIT(drv->state_count)) ||
 		    ((icpu->use_acpi || force_use_acpi) &&
 		     intel_idle_off_by_default(mwait_hint) &&
-		     !(cpuidle_state_table[cstate].flags & CPUIDLE_FLAG_ALWAYS_ENABLE)))
+		     !(drv->states[drv->state_count].flags & CPUIDLE_FLAG_ALWAYS_ENABLE)))
 			drv->states[drv->state_count].flags |= CPUIDLE_FLAG_OFF;
 
 		if (intel_idle_state_needs_timer_stop(&drv->states[drv->state_count]))