can: EG20T PCH: use BIT(X)

Replace bit assignment value to BIT(X).
For easy to readable/identifiable, replace all bit assigned macros to BIT(X)

Signed-off-by: Tomoya MORINAGA <tomoya-linux@dsn.okisemi.com>
Acked-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>