Older families like F1 and F4 have a consistent naming for the CAN
peripherals: CAN when there is only one instance, CAN1/CAN2/CAN2 if
there are multiple instances.
Newer families like L4 and F7 use the name CAN1 even if there is only
one instance. The number of filter banks is incorrect for those.
Affected chips:
* STM32F722
* STM32F723
* STM32F730
* STM32F732
* STM32F733
* STM32L4P5
* STM32L4Q5
* STM32L4R5
* STM32L4R7
* STM32L4R9
* STM32L4S5
* STM32L4S7
* STM32L4S9
* STM32L431
* STM32L432
* STM32L433
* STM32L442
* STM32L443
* STM32L451
* STM32L452
* STM32L462
* STM32L471
* STM32L475
* STM32L476
* STM32L485
* STM32L486
