PCI: shpchp: Remove unused get_mode1_ECC_cap callback

The ->get_mode1_ECC_cap callback in the shpchp_hpc_ops struct is never
called, so remove it.

[bhelgaas: squash]
Link: https://lore.kernel.org/r/20221112142859.319733-2-ian@linux.cowan.aero
Link: https://lore.kernel.org/r/20221112142859.319733-3-ian@linux.cowan.aero
Link: https://lore.kernel.org/r/20221112142859.319733-4-ian@linux.cowan.aero


Signed-off-by: Ian Cowan <ian@linux.cowan.aero>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>