drivers: can: mcp2515: correct min/max timing values

The MCP2515 requires phase segment 2 to be at least 2 time quanta.

The prescaler has a 6 bit register, allowing for real-world prescaler
values between 1 and 64.

Fixes: #44484

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