This fixes a warning

	warning: (IMX_HAVE_PLATFORM_FLEXCAN && ARCH_MXC) selects HAVE_CAN_FLEXCAN which has unmet direct dependencies (NET && CAN)

(The warning in general exists since

	246cf9c2 (kbuild: Warn on selecting symbols with unmet direct dependencies)

which was reverted between 71ebc01d and b1f7d6e1.)
Reported-and-introduced-by: NMarc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: NUwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: NSascha Hauer <s.hauer@pengutronix.de>