esxi: add warning for losing efi state

we cannot import the state of the efivars (e.g. boot order)
so add a warning for that

Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
 [ TL: add new warning to return schema ]
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

src/PVE/API2/Storage/Status.pm

@@ -746,6 +746,7 @@ __PACKAGE__->register_method({
 			    description => 'What this warning is about.',
 			    enum => [
 				'cdrom-image-ignored',
+				'efi-state-lost',
 				'guest-is-running',
 				'nvme-unsupported',
 				'ovmf-with-lsi-unsupported',

src/PVE/Storage/ESXiPlugin.pm

@@ -955,6 +955,7 @@ sub get_create_args {
     if ($firmware eq 'efi') {
 	$create_args->{bios} = 'ovmf';
 	$create_disks->{efidisk0} = 1;
+	$warn->('efi-state-lost', key => "bios", value => "ovmf");
     } else {
 	$create_args->{bios} = 'seabios';
     }