PCI: Use consistent put_user() pointer types

PCI: Use consistent put_user() pointer types

We used u8, u16, and u32 for get_user() pointer types, but "unsigned char",
"unsigned short", and "unsigned int" for put_user().

Use u8, u16, and u32 for put_user() for consistency.  No functional change
intended.

Link: https://lore.kernel.org/r/20230824193712.542167-6-helgaas@kernel.org
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>