chrysler safety: fix mutations failures

[maxime-desroches]

Add coverage for these lines:

panda/board/safety/safety_chrysler.h

Lines 85 to 91 in f5e1900

	if ((chrysler_platform != CHRYSLER_PACIFICA) && (bus == 0) && (addr == chrysler_addrs->ESP_8)) {
	vehicle_moving = ((GET_BYTE(to_push, 4) << 8) + GET_BYTE(to_push, 5)) != 0U;
	}
	if ((chrysler_platform == CHRYSLER_PACIFICA) && (bus == 0) && (addr == 514)) {
	int speed_l = (GET_BYTE(to_push, 0) << 4) + (GET_BYTE(to_push, 1) >> 4);
	int speed_r = (GET_BYTE(to_push, 2) << 4) + (GET_BYTE(to_push, 3) >> 4);
	vehicle_moving = (speed_l != 0) || (speed_r != 0);

Changed the way the check is done in order to be fully testable