drivers: can: stm32h7: use bosch m_can timing parameter initializers

The minimum/maximum CAN timing parameters for the STM32H7 FDCAN driver uses
the wrong values for the minimum, nominal phase segment values.

Using the static initializers fixes these and aligns them to the Bosch
M_CAN manual. The STM32H7 reference manual contains contradicting limits
for these register values.

Fixes: #58429

Signed-off-by: Henrik Brix Andersen <hebad@vestas.com>