can: remove obsolete PCH CAN driver

The PCH CAN driver is a driver for a Bosch C_CAN controller IP core which
is attached to the system via PCI. This code has been introduced in 2011
by Oki Semiconductors developers to support the Intel Atom E6xx series
I/O Hub (aka EG20T IOH PCH CAN). Since 2012 the driver only has been
maintained by the kernel community.

As there is a well maintained and continously tested C_CAN/D_CAN driver
which also supports the PCI configuration from the PCH CAN EG20T setup
this driver became obsolete.

Cc: Jacob Kroon <jacob.kroon@gmail.com>
Cc: Marc Kleine-Budde <mkl@pengutronix.de>
Cc: Dario Binacchi <dariobin@libero.it>
Cc: Wolfgang Grandegger <wg@grandegger.com>
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Link: https://lore.kernel.org/all/20220924174424.86541-1-socketcan@hartkopp.net


Acked-by: Jacob Kroon <jacob.kroon@gmail.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>