drivers: can: kvaser_pci: Fix incorrect RAM context struct type

The can_kvaser_pci_data_##inst type was supposed to be
can_kvaser_pci_data and not can_kvaser_pci_config. This got unnoticed
because there were no struct members to pre-initialize, and a reference
to the struct was stored using a void pointer.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>