[stm32] Switch FDCAN from Queue Mode to FIFO Mode

Queue Mode will send CAN frames in priority order according to their
arbitration ID. This is inconsistent with modm's software-managed queue
which is a strict FIFO. To make the behavior of the driver consistent
with an end-to-end FIFO order, we disable Queue Mode.

Note that the fdcan unit test was implicitly assuming FIFO order. This
change also fixes that test for larger HW TX buffer sizes.

src/modm/platform/can/stm32-fdcan/can.cpp.in

@@ -256,9 +256,6 @@ modm::platform::Fdcan{{ id }}::initializeWithPrescaler(
 	{{ reg }}->RXGFC |= (MessageRam::Config.filterCountStandard << FDCAN_RXGFC_LSS_Pos) | (MessageRam::Config.filterCountExtended << FDCAN_RXGFC_LSE_Pos);
 %%endif
 
-	// Tx buffer: queue mode
-	{{ reg }}->TXBC |= FDCAN_TXBC_TFQM;
-
 	// Enable bit rate switching and CANFD frame format
 	if(fdDataTimings) {
 		{{ reg }}->CCCR |= FDCAN_CCCR_BRSE | FDCAN_CCCR_FDOE;