Revert "cpuidle: apple: Do not load on unsupported Apple platforms"

This reverts commit a8b6518.

Author: jannau

drivers/cpuidle/cpuidle-apple.c

@@ -6,15 +6,12 @@
  */
 
 #include <linux/init.h>
-#include <linux/bitfield.h>
 #include <linux/cpuidle.h>
 #include <linux/cpu_pm.h>
 #include <linux/platform_device.h>
 #include <linux/of.h>
 #include <asm/cpuidle.h>
 
-#define DEEP_WFI_STATE_RETENTION BIT(2) // retains base CPU registers in deep WFI
-
 enum idle_state {
 	STATE_WFI,
 	STATE_PWRDOWN,
@@ -149,11 +146,6 @@ static int __init apple_cpuidle_init(void)
 	if (!of_machine_is_compatible("apple,arm-platform"))
 		return 0;
 
-	if (!FIELD_GET(DEEP_WFI_STATE_RETENTION, read_sysreg(aidr_el1))) {
-		pr_info("cpuidle-apple: CPU does not retain state in deep WFI\n");
-		return 0;
-	}
-
 	pdev = platform_device_register_simple("cpuidle-apple", -1, NULL, 0);
 	if (IS_ERR(pdev)) {
 		platform_driver_unregister(&apple_cpuidle_driver);