Add trait bounds for Error enums

[HusseinAbdelhamid]

The enum errors here should have Transfer and OutputPin as trait bounds for the generic arguments

rt-mcp2517/src/can.rs

Lines 27 to 63 in 206ce3d

	#[derive(Debug, PartialEq)]
	pub enum BusError<B, CS> {
	/// Failed setting state of CS pin
	CSError(CS),
	/// SPI transfer failed
	TransferError(B),
	}
	/// Configuration errors
	#[derive(Debug, PartialEq)]
	pub enum ConfigError<B, CS> {
	/// Low level bus communication error
	BusError(BusError<B, CS>),
	/// Internal clock error
	ClockError,
	/// No configuration mode within timeout of 2 ms
	ConfigurationModeTimeout,
	/// Device did not enter given request mode within timeout of 2 ms
	RequestModeTimeout,
	}
	/// Possible errors transmitting CAN message
	#[derive(Debug, PartialEq)]
	pub enum Error<B, CS> {
	/// Configuration error
	ConfigErr(ConfigError<B, CS>),
	/// SPI bus transfer error
	BusErr(BusError<B, CS>),
	/// Invalid payload bytes length error
	InvalidPayloadLength(usize),
	/// Invalid Ram Address region error
	InvalidRamAddress(u16),
	}