can: kvaser_pciefd: Remove SPI flash parameter read functionality

Remove SPI flash parameter read functionality, since it's only used for
reading the interface CAN controller count.
This information is already read from a register, making the information
redundant.

Signed-off-by: Jimmy Assarsson <extja@kvaser.com>
Reviewed-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Link: https://lore.kernel.org/all/20230529134248.752036-7-extja@kvaser.com


Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>