NVIDIA: SAUCE: [Config] Add PCI_CXL annotation for CXL state save/restore

BugLink: https://bugs.launchpad.net/bugs/2143032

Source: a5544cb

Add Ubuntu kernel config annotation for CONFIG_PCI_CXL introduced by
the CXL DVSEC and HDM state save/restore series.

CONFIG_PCI_CXL is a hidden bool auto-enabled when CXL_BUS=y. It gates
compilation of drivers/pci/cxl.o, which saves and restores CXL DVSEC
control/range registers and HDM decoder state across PCI resets and
link transitions.

Signed-off-by: Jiandi An <jan@nvidia.com>
Acked-by: Jamie Nguyen <jamien@nvidia.com>
Acked-by: Nirmoy Das <nirmoyd@nvidia.com>
Acked-by: Carol L Soto <csoto@nvidia.com>
Acked-by: Matthew R. Ochs <mochs@nvidia.com>
Signed-off-by: Brad Figg <bfigg@nvidia.com>
(backported from commit a5544cb nv-kernels/24.04_linux-nvidia-6.17-next)
[kobak: Backported annotation override from debian.nvidia-6.17 to debian.nvidia-bos.]
Signed-off-by: Koba Ko <kobak@nvidia.com>

Author: JiandiAnNVIDIA

debian.nvidia-bos/config/annotations

@@ -273,6 +273,9 @@ CONFIG_DEV_DAX_CXL                              note<'Override debian.master m->
 CONFIG_DEV_DAX_KMEM                             policy<{'amd64': 'y', 'arm64': 'y'}>
 CONFIG_DEV_DAX_KMEM                             note<'Override debian.master m->y; map CXL DAX devices as System-RAM'>
 
+CONFIG_PCI_CXL                                  policy<{'amd64': 'y', 'arm64': 'y'}>
+CONFIG_PCI_CXL                                  note<'Hidden bool; auto-enabled by CXL_BUS; PCI core CXL DVSEC and HDM state save/restore support'>
+
 CONFIG_VFIO_CONTAINER                           policy<{'amd64': 'y', 'arm64': 'n'}>
 CONFIG_VFIO_CONTAINER                           note<'LP: #2095028'>