efi: Export efi_query_variable_store() for efivars.ko

commit 3668011d upstream.

Fixes build with CONFIG_EFI_VARS=m which was broken after the commit
"x86, efivars: firmware bug workarounds should be in platform code".
Signed-off-by: Sergey Vlasov <vsu@altlinux.ru>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Cc: Rui Xiang <rui.xiang@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

arch/x86/platform/efi/efi.c

@@ -990,3 +990,4 @@ efi_status_t efi_query_variable_store(u32 attributes, unsigned long size)
 
 	return EFI_SUCCESS;
 }
+EXPORT_SYMBOL_GPL(efi_query_variable_store);