efi: Delete deprecated parameter comments

Delete deprecated parameter comments to  fix warnings reported by make
W=1.
drivers/firmware/efi/vars.c:428: warning: Excess function parameter
'atomic' description in 'efivar_init'
Signed-off-by: Tian Tao <tiantao6@hisilicon.com>
Link: https://lore.kernel.org/r/1600914018-12697-1-git-send-email-tiantao6@hisilicon.comSigned-off-by: Ard Biesheuvel <ardb@kernel.org>

drivers/firmware/efi/vars.c

@@ -414,7 +414,6 @@ static void dup_variable_bug(efi_char16_t *str16, efi_guid_t *vendor_guid,
  * efivar_init - build the initial list of EFI variables
  * @func: callback function to invoke for every variable
  * @data: function-specific data to pass to @func
- * @atomic: do we need to execute the @func-loop atomically?
  * @duplicates: error if we encounter duplicates on @head?
  * @head: initialised head of variable list
  *