can: Disable flexcan driver build for big endian CPU on ARM

Building arm:allmodconfig fails with

flexcan.c: In function 'flexcan_read':
flexcan.c:243:2: error: implicit declaration of function 'in_be32'
flexcan.c: In function 'flexcan_write':
flexcan.c:248:2: error: implicit declaration of function 'out_be32'

in_be32 and out_be32 do not (or no longer) exist for ARM targets.
Disable the build for ARM on big endian CPUs.
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

drivers/net/can/Kconfig

@@ -104,7 +104,7 @@ config CAN_JANZ_ICAN3
 
 config CAN_FLEXCAN
 	tristate "Support for Freescale FLEXCAN based chips"
-	depends on ARM || PPC
+	depends on (ARM && CPU_LITTLE_ENDIAN) || PPC
 	---help---
 	  Say Y here if you want to support for Freescale FlexCAN.