can: xilinx_can: fix typo prescalar -> prescaler

This patch fixes the typo prescalar -> prescaler.

Link: https://lore.kernel.org/all/20220609111424.3819039-1-mkl@pengutronix.de


Reported-by: Vincent MAILHOL <mailhol.vincent@wanadoo.fr>
Cc: Srinivas Neeli <srinivas.neeli@xilinx.com>
Cc: Appana Durga Kedareswara rao <appana.durga.rao@xilinx.com>
Cc: Naga Sureshkumar Relli <naga.sureshkumar.relli@xilinx.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>