ACPI: PM: s2idle: Staticise LPS0 callback functions

The LPS0 callback functions in x86/s2idle.c can be made static, so do
that and remove their declarations from sleep.h.

While at it, add the _lps0 suffix to their names to indicate that
they are LPS0-specific.

No functional impact.

Signed-off-by: Rafael J. Wysocki <[e-mail]>
Reviewed-by: Mario Limonciello (AMD) <[e-mail]>
Link: https://patch.msgid.link/[e-mail]

drivers/acpi/sleep.h

···
 
 extern int acpi_s2idle_begin(void);
 extern int acpi_s2idle_prepare(void);
-extern int acpi_s2idle_prepare_late(void);
-extern void acpi_s2idle_check(void);
 extern bool acpi_s2idle_wake(void);
-extern void acpi_s2idle_restore_early(void);
 extern void acpi_s2idle_restore(void);
 extern void acpi_s2idle_end(void);
 

drivers/acpi/x86/s2idle.c

···
 	.attach = lps0_device_attach,
 };
 
-int acpi_s2idle_prepare_late(void)
+static int acpi_s2idle_prepare_late_lps0(void)
 {
 	struct acpi_s2idle_dev_ops *handler;
 
···
 	return 0;
 }
 
-void acpi_s2idle_check(void)
+static void acpi_s2idle_check_lps0(void)
 {
 	struct acpi_s2idle_dev_ops *handler;
 
···
 	}
 }
 
-void acpi_s2idle_restore_early(void)
+static void acpi_s2idle_restore_early_lps0(void)
 {
 	struct acpi_s2idle_dev_ops *handler;
 
···
 static const struct platform_s2idle_ops acpi_s2idle_ops_lps0 = {
 	.begin = acpi_s2idle_begin,
 	.prepare = acpi_s2idle_prepare,
-	.prepare_late = acpi_s2idle_prepare_late,
-	.check = acpi_s2idle_check,
+	.prepare_late = acpi_s2idle_prepare_late_lps0,
+	.check = acpi_s2idle_check_lps0,
 	.wake = acpi_s2idle_wake,
-	.restore_early = acpi_s2idle_restore_early,
+	.restore_early = acpi_s2idle_restore_early_lps0,
 	.restore = acpi_s2idle_restore,
 	.end = acpi_s2idle_end,
 };