can: tcan4x5x: fix max register value

stable inclusion
from stable-5.10.28
commit 4094194d103b2a226316bf56437bc4ad79b76983
bugzilla: 51779

--------------------------------

[ Upstream commit 6e1caaf8 ]

This patch fixes the max register value for the regmap.

Reviewed-by: Dan Murphy <dmurphy@ti.com>
Tested-by: Sean Nyekjaer <sean@geanix.com>
Link: https://lore.kernel.org/r/20201215231746.1132907-12-mkl@pengutronix.de


Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Chen Jun <chenjun102@huawei.com>
Acked-by:   Weilong Chen <chenweilong@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>