ACPI: cmos_rtc: Using pr_fmt() and remove PREFIX

Introduce pr_fmt() and remove printk PREFIX to unify the
log message printing.

Signed-off-by: Hanjun Guo <[e-mail]>
Signed-off-by: Rafael J. Wysocki <[e-mail]>

drivers/acpi/acpi_cmos_rtc.c

···
  * Authors: Lan Tianyu <[e-mail]>
  */
 
+#define pr_fmt(fmt) "ACPI: " fmt
+
 #include <linux/acpi.h>
 #include <linux/device.h>
 #include <linux/err.h>
···
 			&acpi_cmos_rtc_space_handler,
 			NULL, NULL);
 	if (ACPI_FAILURE(status)) {
-		pr_err(PREFIX "Error installing CMOS-RTC region handler\n");
+		pr_err("Error installing CMOS-RTC region handler\n");
 		return -ENODEV;
 	}
 
···
 {
 	if (ACPI_FAILURE(acpi_remove_address_space_handler(adev->handle,
 			ACPI_ADR_SPACE_CMOS, &acpi_cmos_rtc_space_handler)))
-		pr_err(PREFIX "Error removing CMOS-RTC region handler\n");
+		pr_err("Error removing CMOS-RTC region handler\n");
 }
 
 static struct acpi_scan_handler cmos_rtc_handler = {