imx: only select HAVE_CAN_FLEXCAN if CAN is enabled

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: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

arch/arm/plat-mxc/devices/Kconfig

@@ -6,7 +6,7 @@ config IMX_HAVE_PLATFORM_FEC
 	default y if ARCH_MX25 || SOC_IMX27 || ARCH_MX35 || ARCH_MX51
 
 config IMX_HAVE_PLATFORM_FLEXCAN
-	select HAVE_CAN_FLEXCAN
+	select HAVE_CAN_FLEXCAN if CAN
 	bool
 
 config IMX_HAVE_PLATFORM_IMX_I2C