arch/x86: Remove efi_set_rtc_mmss()

efi_set_rtc_mmss() is never used to set RTC due to bugs found
on many EFI platforms. It is set directly by mach_set_rtc_mmss().
Hence, remove unused efi_set_rtc_mmss() function.
Signed-off-by: Daniel Kiper <daniel.kiper@oracle.com>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>

arch/x86/platform/efi/efi.c

@@ -104,42 +104,6 @@ static efi_status_t __init phys_efi_set_virtual_address_map(
 	return status;
 }
 
-int efi_set_rtc_mmss(const struct timespec *now)
-{
-	unsigned long nowtime = now->tv_sec;
-	efi_status_t	status;
-	efi_time_t	eft;
-	efi_time_cap_t	cap;
-	struct rtc_time	tm;
-
-	status = efi.get_time(&eft, &cap);
-	if (status != EFI_SUCCESS) {
-		pr_err("Oops: efitime: can't read time!\n");
-		return -1;
-	}
-
-	rtc_time_to_tm(nowtime, &tm);
-	if (!rtc_valid_tm(&tm)) {
-		eft.year = tm.tm_year + 1900;
-		eft.month = tm.tm_mon + 1;
-		eft.day = tm.tm_mday;
-		eft.minute = tm.tm_min;
-		eft.second = tm.tm_sec;
-		eft.nanosecond = 0;
-	} else {
-		pr_err("%s: Invalid EFI RTC value: write of %lx to EFI RTC failed\n",
-		       __func__, nowtime);
-		return -1;
-	}
-
-	status = efi.set_time(&eft);
-	if (status != EFI_SUCCESS) {
-		pr_err("Oops: efitime: can't write time!\n");
-		return -1;
-	}
-	return 0;
-}
-
 void efi_get_time(struct timespec *now)
 {
 	efi_status_t status;

include/linux/efi.h

@@ -873,7 +873,6 @@ extern int __init efi_uart_console_only (void);
 extern void efi_initialize_iomem_resources(struct resource *code_resource,
 		struct resource *data_resource, struct resource *bss_resource);
 extern void efi_get_time(struct timespec *now);
-extern int efi_set_rtc_mmss(const struct timespec *now);
 extern void efi_reserve_boot_services(void);
 extern int efi_get_fdt_params(struct efi_fdt_params *params, int verbose);
 extern struct efi_memory_map memmap;