efi_loader: efi_auth_var_type for AuditMode, DeployedMode

Writing variables AuditMode and DeployedMode serves to switch between
Secure Boot modes. Provide a separate value for these in efi_auth_var_type.

With this patch the variables will not be read from from file even if they
are marked as non-volatile by mistake.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
diff --git a/include/efi_variable.h b/include/efi_variable.h
index 2d97655..0440d35 100644
--- a/include/efi_variable.h
+++ b/include/efi_variable.h
@@ -12,6 +12,7 @@
 
 enum efi_auth_var_type {
 	EFI_AUTH_VAR_NONE = 0,
+	EFI_AUTH_MODE,
 	EFI_AUTH_VAR_PK,
 	EFI_AUTH_VAR_KEK,
 	EFI_AUTH_VAR_DB,