c_can_pci: generic module for C_CAN/D_CAN on PCI

Signed-off-by: Federico Vaga <federico.vaga@gmail.com>
Acked-by: Giancarlo Asnaghi <giancarlo.asnaghi@st.com>
Cc: Alan Cox <alan@linux.intel.com>
Acked-by: Wolfgang Grandegger <wg@grandegger.com>
Acked-by: Bhupesh Sharma <bhupesh.sharma@st.com>
[mkl: fix call to pci_iounmap]
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>