can: mcp251xfd: mcp251xfd_probe(): fix errata reference

This patch fixes the reference to the errata for both the mcp2517fd
and the mcp2518fd.

Fixes: f5b84ded ("can: mcp25xxfd: mcp25xxfd_probe(): add SPI clk limit related errata information")
Link: https://lore.kernel.org/r/20210128104644.2982125-2-mkl@pengutronix.de


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